Showing posts with label Jupiter. Show all posts
Showing posts with label Jupiter. Show all posts

Tuesday, September 2, 2025

A Mysterious Object Near Jupiter: What Could It Be?

A Mysterious Object Near Jupiter: What Could It Be?

The vastness of space has always captivated human imagination, and few places in our solar system spark as much curiosity as Jupiter, the gas giant with its swirling storms, enigmatic moons, and immense gravitational pull. Recently, a hypothetical scenario has stirred the minds of astronomers, scientists, and space enthusiasts alike: the discovery of a spacecraft-sized object near Jupiter. But what could such an object be? Is it a natural phenomenon, a human-made artifact, or something far more extraordinary? In this exploration, we’ll dive into the possibilities, blending science, speculation, and a touch of cosmic wonder to unravel the mystery of this enigmatic object.


 Setting the Scene: Jupiter’s Cosmic Neighborhood

Jupiter, the fifth planet from the Sun, is a behemoth. With a diameter of roughly 86,881 miles (139,820 kilometers), it’s more than 11 times the size of Earth. Its powerful magnetic field and intense gravity make it a focal point for studying the dynamics of our solar system. Jupiter is surrounded by at least 95 known moons, a faint ring system, and a region teeming with asteroids and other celestial debris. The idea of a spacecraft-sized object—something roughly the size of a modern space probe or satellite, say 10 to 100 meters in length—appearing in this environment raises fascinating questions.

For context, a spacecraft-sized object could be anything from a small probe like NASA’s Voyager (about 20 meters long with its antenna) to a larger structure akin to the International Space Station (roughly 109 meters long). Such an object, detected near Jupiter, would stand out due to its size, motion, or reflective properties, especially if it doesn’t behave like a typical asteroid or comet. Let’s explore the possibilities, ranging from the mundane to the mind-bending.


 Possibility 1: A Natural Celestial Object

The most straightforward explanation for a spacecraft-sized object near Jupiter is that it’s a natural body, such as an asteroid, comet, or moonlet. Jupiter’s gravitational influence is immense, capturing countless objects into its orbit over billions of years. These objects, known as Trojan asteroids, irregular moons, or temporary satellites, often have irregular shapes and sizes that could mimic a spacecraft.

- Trojan Asteroids: Jupiter shares its orbit with thousands of Trojan asteroids, which congregate at stable gravitational points called Lagrange points (L4 and L5). Some of these asteroids are small enough to fall within the spacecraft-size range. A particularly reflective or metallic asteroid might appear artificial at first glance, especially if its surface scatters light in a way that mimics a manufactured object.

- Irregular Moons: Jupiter’s irregular moons, unlike its large Galilean moons (Io, Europa, Ganymede, and Callisto), are often small, captured objects with eccentric orbits. A moonlet in the 10–100-meter range could be mistaken for a spacecraft, especially if it has an unusual shape or surface composition. For example, some moons have high albedo (reflectivity), making them stand out against the backdrop of space.

- Interstellar Interlopers: The discovery of ‘Oumuamua in 2017, the first confirmed interstellar object passing through our solar system, opened the door to the possibility of extraterrestrial objects wandering near Jupiter. A spacecraft-sized interstellar asteroid or comet, caught temporarily by Jupiter’s gravity, could appear anomalous, especially if it exhibits non-gravitational acceleration (as ‘Oumuamua did, possibly due to outgassing).


While these natural explanations are the most likely, they don’t fully satisfy the imagination. A natural object would typically lack the precise structure, motion, or signals associated with a spacecraft. If the object exhibits unusual behavior—say, controlled movement or radio emissions—it pushes us toward more speculative possibilities.

 Possibility 2: Human-Made Spacecraft or Debris

Could the object be a relic of human exploration? Since the 1970s, humanity has sent several spacecraft to Jupiter, including Pioneer 10 and 11, Voyager 1 and 2, Galileo, Juno, and the more recent Europa Clipper. These missions have left behind probes, orbiters, and even fragments that could, in theory, linger in Jupiter’s vicinity.

- Known Spacecraft: Most of our Jupiter-bound spacecraft are accounted for. For example, Galileo was intentionally crashed into Jupiter in 2003 to avoid contaminating its moons, and Juno remains in orbit as of 2025. However, a malfunctioning probe or an untracked component (like a detached antenna or stage) could theoretically appear as a mysterious object. Voyager 1 and 2, now in interstellar space, passed by Jupiter decades ago, but smaller debris from their flybys could still be in the region.

- Space Debris: Space exploration generates debris, from discarded rocket stages to lost tools. While most debris remains in Earth’s orbit, some missions to the outer solar system could have left fragments that ended up near Jupiter. A reflective piece of metal, spinning in a way that catches sunlight, might resemble a spacecraft-sized object.

- Secret Missions: A more speculative angle involves classified or unannounced missions. Governments or private entities could have launched probes to Jupiter without public disclosure. For instance, a prototype spacecraft testing advanced propulsion could be mistaken for an unknown object. However, the logistics of keeping such a mission secret, especially in the era of global telescope networks, make this unlikely.

The human-made explanation falters if the object exhibits technology or behavior beyond our current capabilities, such as rapid course corrections or non-chemical propulsion. This leads us to the most tantalizing possibility: an extraterrestrial origin.


 Possibility 3: An Alien Artifact

The idea of an alien spacecraft or probe near Jupiter is the stuff of science fiction dreams, but it’s worth exploring through a scientific lens. The search for extraterrestrial intelligence (SETI) has long considered our solar system a potential target for alien exploration, and Jupiter—being a prominent and resource-rich planet—could be a logical destination for an advanced civilization’s probe.

- A Visiting Probe: An extraterrestrial probe, similar in size to our own spacecraft, could be exploring Jupiter’s system, perhaps studying its moons (Europa, with its subsurface ocean, is a prime candidate for astrobiological interest). Such a probe might emit radio signals, move in ways inconsistent with natural orbits, or reflect light in a manner suggesting a polished, artificial surface. The ‘Oumuamua debate, where some scientists (like Harvard’s Avi Loeb) proposed it could be an alien artifact, shows how such ideas gain traction when objects defy easy categorization.

- A Relic of an Ancient Civilization: Jupiter’s long history makes it a potential repository for ancient artifacts. An alien probe or structure, perhaps millions of years old, could have been captured by Jupiter’s gravity and remained dormant until detected. Such an object might resemble the monolith from 2001: A Space Odyssey, a silent sentinel waiting to be discovered.

- A Megastructure Fragment: While a full-scale Dyson Sphere or megastructure is unlikely, a smaller component—say, a piece of an alien satellite or solar collector—could fit the spacecraft-size description. If it’s made of exotic materials or exhibits unusual electromagnetic properties, it could stand out starkly against Jupiter’s natural environment.

The alien hypothesis, while exciting, faces significant hurdles. The Fermi Paradox—why haven’t we seen clear evidence of extraterrestrial life?—suggests that if an alien object exists, it’s either deliberately hidden or extremely rare. Additionally, Occam’s Razor favors simpler explanations (like a natural object) unless definitive evidence, such as structured radio signals or clear artificial design, emerges.


 Possibility 4: A Novel Phenomenon or Anomaly

Beyond the categories of natural, human-made, or alien, the object could represent a phenomenon we don’t yet fully understand. Jupiter’s environment is complex, with intense magnetic fields, radiation belts, and atmospheric dynamics that could produce unusual effects.

- Plasma or Magnetic Anomaly: Jupiter’s magnetosphere, one of the largest structures in the solar system, generates powerful auroras and plasma interactions. A localized plasma phenomenon or magnetic disturbance could create a reflective or emissive “object” that appears spacecraft-sized on our instruments. For example, a concentrated plasma torus near Io might mimic a solid object under certain observational conditions.

- Exotic Matter or Particles: Theoretical physics allows for exotic objects, such as microscopic black holes, strangelets, or dark matter clumps, though these are unlikely to be spacecraft-sized. A speculative possibility is a stable, macroscopic quantum object or a remnant of some cosmic process, temporarily visible near Jupiter.

- Optical Illusion or Instrumental Error: Telescopes and space observatories, like the James Webb Space Telescope or ground-based arrays, are incredibly sensitive but not infallible. A glitch, cosmic ray hit, or misinterpretation of data could make a natural object appear artificial. For instance, a distant star’s light, refracted through Jupiter’s atmosphere, might create a fleeting, spacecraft-like signature.

These possibilities remind us that our understanding of the universe is incomplete. A mysterious object could be a clue to new physics or a reminder of the challenges in interpreting distant observations.


 How Would We Investigate?

If a spacecraft-sized object were detected near Jupiter, scientists would mobilize a multi-pronged approach to study it:

- Telescopic Observations: Ground-based telescopes, like the Very Large Telescope in Chile, and space-based observatories, like Hubble or James Webb, would analyze the object’s spectrum, reflectivity, and motion. This would help determine its composition (rocky, metallic, or exotic) and trajectory.

- Radio and Signal Analysis: SETI researchers would scan for radio emissions or other signals that might indicate artificial origin. Even weak or intermittent signals could provide clues.

- Spacecraft Flyby: If resources allow, a mission like NASA’s Juno or a future probe could be redirected for a closer look. A flyby would provide high-resolution images and data on the object’s structure and behavior.

- Modeling and Simulation: Scientists would use computer models to test whether the object’s behavior matches known natural phenomena, human technology, or something else entirely.

Public reaction would likely be intense, with social media platforms buzzing with theories ranging from aliens to secret government projects. Scientists would urge caution, emphasizing the need for rigorous analysis before jumping to conclusions.


 The Bigger Picture: Why It Matters

The discovery of a spacecraft-sized object near Jupiter would be more than a scientific curiosity—it would challenge our understanding of the universe and our place in it. A natural object would deepen our knowledge of Jupiter’s complex environment. A human-made artifact would highlight the legacy of our exploration efforts. And an alien object? That would rewrite history, confirming we’re not alone and sparking a new era of cosmic inquiry.

Jupiter, with its grandeur and mysteries, is a fitting stage for such a discovery. Its moons, like Europa and Ganymede, are prime targets in the search for life, and its vast gravitational reach makes it a natural hub for cosmic visitors, whether asteroids or something more. The object, whatever it is, would remind us that the universe is full of surprises, waiting to be explored.


 Conclusion: Embracing the Unknown

As we ponder the nature of a spacecraft-sized object near Jupiter, we’re reminded of the thrill of exploration. Whether it’s a rogue asteroid, a forgotten probe, an alien artifact, or something entirely new, the object represents the frontier of human curiosity. It challenges us to look up, to question, and to dream. As we continue to probe the mysteries of Jupiter and beyond, we may find that the answers are as awe-inspiring as the questions themselves.

What do you think this object could be? A chunk of cosmic rock, a lost piece of human ingenuity, or a beacon from another world? The universe is vast, and the possibilities are endless. Let’s keep our eyes on the skies—and our minds open to the wonders that await.


- Sources:

1. Bagenal, F. (2017). Jupiter: The Planet, Satellites and Magnetosphere. Cambridge University Press.

2. Dyson, F. J. (1960). “Search for Artificial Stellar Sources of Infrared Radiation.” Science, 131(3414), 1667–1668.

3. European Space Agency (ESA). (2022). Space Debris: The Growing Threat. Retrieved from https://www.esa.int/Safety_Security/Space_Debris

4. European Southern Observatory (ESO). (2021). Very Large Telescope: Technical Overview. Retrieved from https://www.eso.org/sci/facilities/vlt/

5. Hawking, S. W. (1974). “Black Hole Explosions?” Nature, 248(5443), 30–31.

6. Jewitt, D. (2018). “The Trojan Asteroids: Keys to Jupiter’s Past.” Annual Review of Astronomy and Astrophysics, 56, 137–167.

7. Loeb, A. (2021). Extraterrestrial: The First Sign of Intelligent Life Beyond Earth. Houghton Mifflin Harcourt.

8. Meech, K. J., et al. (2017). “A Brief Visit from a Red and Extremely Elongated Interstellar Asteroid.” Nature, 552(7685), 378–381.

9. NASA. (2023). Jupiter: Facts and Figures. Retrieved from https://solarsystem.nasa.gov/planets/jupiter/

10. NASA. (2024). Juno Mission Overview. Retrieved from https://www.nasa.gov/mission_pages/juno/

11. Sheppard, S. S. (2019). “The Irregular Satellites of Jupiter.” Icarus, 321, 112–124.

12. Shostak, S. (2020). Confessions of an Alien Hunter: A Scientist’s Search for Extraterrestrial Intelligence. National Geographic.

13. Webb, S. (2015). If the Universe Is Teeming with Aliens ... Where Is Everybody? Springer.


Saturday, August 30, 2025

A Jupiter-Sized Rogue Planet Entering the Solar System

A Jupiter-Sized Rogue Planet Entering the Solar System

 What is a Rogue Planet?

A rogue planet, also known as a free-floating planet or interstellar planet, is a planetary body that does not orbit a star and instead drifts through interstellar space. Unlike planets in our solar system, which are gravitationally bound to the Sun, rogue planets are untethered, moving freely through the galaxy. These objects can range in size from small, rocky bodies to gas giants comparable to Jupiter. They are typically detected through microlensing events, where their gravity bends the light of distant stars, or through direct imaging in infrared wavelengths, as they may emit residual heat from their formation or internal processes.

Rogue planets likely form in one of two ways. First, they may originate in a star system, much like Jupiter or Earth, but are ejected due to gravitational interactions, such as close encounters with other planets or stars. Second, they may form in isolation within dense molecular clouds, collapsing under their own gravity without a parent star. Estimates suggest there could be billions of rogue planets in the Milky Way, with some studies indicating up to two rogue planets per star in the galaxy.


 A Hypothetical Jupiter-Sized Rogue Planet in Our Solar System

Imagine a Jupiter-sized rogue planet, which we’ll call Draconis, entering our solar system around the year 2000. This gas giant, roughly 11 times Earth’s diameter and 300 times its mass, would be a colossal interloper, with a dark, reflective surface illuminated faintly by distant stars or glowing faintly from internal heat. Its arrival would be a monumental event, reshaping our understanding of the solar system and posing significant risks.


 Origin and Trajectory

Draconis likely originated in a distant star system, perhaps within a crowded stellar nursery in the Orion Arm, approximately 1,000 light-years away. It could have been ejected during the chaotic early phases of its parent system’s formation, when gravitational interactions among forming planets or a close pass by another star destabilized its orbit. Alternatively, a stellar encounter in a binary system or a supernova explosion in its vicinity could have flung Draconis into interstellar space millions or billions of years ago.

Traveling at a typical interstellar speed of 10–20 km/s, Draconis would have taken millions of years to cross the vast distance to our solar system. By the year 2000, astronomers detect its approach as it crosses the heliopause—the boundary where the solar wind gives way to the interstellar medium, about 100–120 astronomical units (AU) from the Sun. Its trajectory suggests it entered from the direction of the constellation Ophiuchus, cutting through the outer solar system at a steep angle relative to the ecliptic plane.

Draconis’s path takes it on a hyperbolic trajectory, meaning it will not be captured by the Sun’s gravity but will pass through the solar system and exit back into interstellar space. Its closest approach, or perihelion, is projected to occur around 2005 at approximately 10 AU from the Sun—roughly the orbit of Saturn. This trajectory brings it perilously close to the inner solar system, raising concerns about its gravitational influence on nearby planets, including Earth.


 Detection and Observation

In 2000, Draconis would likely be detected by infrared telescopes, such as the Two Micron All-Sky Survey (2MASS), or through perturbations in the orbits of outer solar system objects like Kuiper Belt objects or comets. Its massive size would make it a faint but detectable object, possibly glowing in infrared due to residual heat from its formation or radioactive decay in its core. By 2002, major observatories like Hubble and ground-based telescopes would confirm its size and composition, revealing a gas giant with a thick atmosphere of hydrogen and helium, possibly laced with methane and ammonia, similar to Jupiter.


 Dangers of a Jupiter-Sized Rogue Planet in the Solar System

The arrival of a Jupiter-sized rogue planet like Draconis poses several significant dangers to the solar system, particularly if it passes within 10 AU of the Sun.


1. Gravitational Perturbations:  

   Draconis’s immense mass—equivalent to Jupiter’s—would exert significant gravitational influence on the solar system’s planets, asteroids, and comets. As it passes through the outer solar system, it could destabilize the orbits of Kuiper Belt objects, sending comets and icy bodies hurtling toward the inner solar system. This could increase the risk of impacts on Earth, potentially triggering catastrophic events akin to the Chicxulub impact that led to the extinction of the dinosaurs.

   In the inner solar system, Draconis’s gravity could perturb the orbits of planets like Jupiter, Saturn, and even the terrestrial planets. While a direct collision with Earth is unlikely given its trajectory, even a distant pass could cause subtle shifts in Earth’s orbit or axial tilt over time, potentially affecting climate patterns. For example, a 0.1% change in Earth’s orbit could alter solar insolation, leading to long-term climate shifts.


2. Impact on Earth’s Environment:  

   If Draconis passes within 10 AU, its gravitational influence could disrupt the asteroid belt, increasing the likelihood of asteroid collisions with Earth. Additionally, its passage could trigger a surge in cometary activity, with long-period comets bombarding the inner solar system. A single large comet impact could cause widespread devastation, including tsunamis, wildfires, and a “nuclear winter” effect from dust blocking sunlight.

   Fortunately, Draconis’s closest approach at 10 AU places it far from Earth (approximately 9 AU, or 1.3 billion kilometers, from Earth at its nearest point). This distance reduces the immediate risk of catastrophic gravitational effects on Earth itself. However, the long-term consequences of its passage could manifest over decades or centuries as perturbed objects reach the inner solar system.


3. Disruption of the Oort Cloud:  

   The Oort Cloud, a spherical shell of comets extending 2,000–100,000 AU from the Sun, is particularly vulnerable to Draconis’s influence. As the rogue planet passes through or near the inner Oort Cloud, its gravity could dislodge countless comets, sending them on trajectories toward the Sun. This could result in a prolonged period of heightened meteor and comet activity, increasing the risk of impacts across the solar system.


4. Electromagnetic and Atmospheric Effects:  

   If Draconis has a magnetic field similar to Jupiter’s, its interaction with the solar wind could generate intense electromagnetic disturbances, potentially affecting spacecraft and satellite communications. Its atmosphere, if rich in volatile gases, could also release particles that interact with the solar wind, creating auroras or other phenomena visible from Earth.


 Proximity to Earth

At its closest approach in 2005, Draconis would be approximately 9 AU from Earth, a distance comparable to the separation between Earth and Saturn. This is far enough to avoid direct gravitational disruption of Earth’s orbit or immediate catastrophic effects. However, its passage would still be a significant astronomical event, visible through telescopes and potentially causing minor perturbations in the orbits of nearby planets. The greatest risk to Earth lies in the long-term effects, such as increased cometary activity, which could elevate the probability of impacts for centuries.


 References to Rogue Planets in Star Trek

Rogue planets have appeared in several Star Trek episodes and films, often serving as mysterious or hazardous settings. Here are notable examples:


- Star Trek: The Original Series – “The Cage” (1965):  

   In the pilot episode, the Enterprise encounters Talos IV, a planet that, while not explicitly rogue, exists in isolation and hosts a dying civilization. The concept of a planet with no star resonates with the idea of a rogue planet surviving independently.


- Star Trek: The Next Generation – “The Masterpiece Society” (1992):  

   The Enterprise discovers Moab IV, a planet in a remote system that could be interpreted as a rogue or near-rogue body due to its isolation. The episode explores a self-sustaining colony, paralleling the idea of a rogue planet supporting life through internal heat.


- Star Trek: Deep Space Nine – “The Search, Part I” (1994):  

   The Dominion’s homeworld, a rogue planet in the Omarion Nebula, is a key example. This planet lacks a parent star and is shrouded in mystery, with its inhabitants (the Founders) thriving in a unique environment. The rogue planet serves as a plot device to highlight the Dominion’s alien nature.


- Star Trek (2009):  

   The film features Delta Vega, a frozen, seemingly starless world where Spock is marooned. While not explicitly called a rogue planet, its depiction as a barren, isolated body aligns with the concept, emphasizing the desolation and danger of such worlds.

In Star Trek, rogue planets are often portrayed as enigmatic, hostile environments that challenge the crew’s ingenuity. They serve as metaphors for isolation or survival in extreme conditions, a theme that resonates with Draconis’s passage through our solar system.


 Scientific and Cultural Impact

The discovery of Draconis in 2000 would galvanize the scientific community. Astronomers would launch a global effort to track its trajectory, using telescopes like the Hubble Space Telescope, the Chandra X-ray Observatory, and later the James Webb Space Telescope (launched in 2021). Space agencies like NASA and ESA might deploy probes to study Draconis up close, analyzing its composition, magnetic field, and potential moons, which could harbor subsurface oceans or exotic lifeforms sustained by internal heat.

Culturally, Draconis would capture the public’s imagination, inspiring books, movies, and media coverage. Doomsday scenarios might dominate headlines, with fears of apocalyptic impacts, though scientists would emphasize the low immediate risk to Earth. The planet’s passage would also spark philosophical debates about humanity’s place in the cosmos and the prevalence of rogue planets in the galaxy.


 Conclusion

The arrival of a Jupiter-sized rogue planet like Draconis in our solar system in 2000 would be a transformative event, blending awe and danger. Originating from a distant star system, its hyperbolic trajectory would carry it through the outer solar system, passing within 10 AU of the Sun and 9 AU of Earth. While not an immediate threat to Earth, its gravitational influence could destabilize comets and asteroids, increasing the long-term risk of impacts. In Star Trek, rogue planets symbolize mystery and resilience, a fitting parallel for Draconis’s fleeting yet impactful visit. The scientific and cultural ramifications would endure for decades, reminding humanity of the dynamic and unpredictable nature of the cosmos.



Sources

- Bagenal, F., Dowling, T. E., & McKinnon, W. B. (2004). *Jupiter: The Planet, Satellites, and Magnetosphere*. Cambridge University Press.

- Fernandez, J. A., & Ip, W.-H. (1984). “Some dynamical aspects of the accretion of comets.” *Icarus*, 58(1), 109–120.

- Gardner, J. P., et al. (2006). “The James Webb Space Telescope.” *Space Science Reviews*, 123(4), 485–606.

- Hills, J. G. (1981). “Comet showers and the steady-state infall of comets from the Oort Cloud.” *The Astronomical Journal*, 86, 1730–1740.

- Kasting, J. F., Whitmire, D. P., & Reynolds, R. T. (1993). “Habitable zones around main sequence stars.” *Icarus*, 101(1), 108–128.

- Moorhead, A. V., & Adams, F. C. (2008). “Planetary ejection by stellar encounters.” *The Astrophysical Journal*, 674(1), 436–446.

- Mroz, P., et al. (2017). “No large population of unbound or wide-orbit Jupiter-mass planets.” *Nature*, 548(7666), 183–186.

- Oort, J. H. (1950). “The structure of the cloud of comets surrounding the Solar System.” *Bulletin of the Astronomical Institutes of the Netherlands*, 11, 91–110.

- Schulte, P., et al. (2010). “The Chicxulub asteroid impact and mass extinction at the Cretaceous-Paleogene boundary.” *Science*, 327(5970), 1214–1218.

- Skrutskie, M. F., et al. (2006). “The Two Micron All Sky Survey (2MASS).” *The Astronomical Journal*, 131(2), 1163–1183.

- Stone, E. C., et al. (2015). “Voyager 1 observes low-energy galactic cosmic rays in a region depleted of heliospheric ions.” *Science*, 341(6142), 150–153.

- Strigari, L. E., et al. (2012). “Nomads of the Galaxy.” *Monthly Notices of the Royal Astronomical Society*, 423(2), 1856–1865.

- Sumi, T., et al. (2011). “Unbound or distant planetary mass population detected by gravitational microlensing.” *Nature*, 473(7347), 349–352.

- Veras, D., et al. (2011). “The great escape: How planets can be ejected from their systems.” *Monthly Notices of the Royal Astronomical Society*, 417(3), 2104–2113.

- Ward, P. D., & Brownlee, D. (2000). *Rare Earth: Why Complex Life is Uncommon in the Universe*. Copernicus Books.


Tuesday, April 21, 2015

Asteroid 2015 HDI Passing by Earth

Asteroid 2015 HDI is expected to pass by Earth today at 3:11 a.m.  There is no cause for alarm. The asteroid is not expected to hit us.  Asteroid 2015 HDI is about 50 feet wide and will pass by at 0.2 lunar distances or about 46,000 miles over us.

If it was on a collision course with Earth, then there will be no life ending catastrophe occurring.  The asteroid is too small and would lose its battle with Earth's atmosphere and gravity as it is pulled in.

The force around the asteroid will tear it apart into smaller meteorites that will just light up the sky. Asteroids like 2015 HDI pass by Earth all the time granted not as close.  While Earth's gravity is strong, it cannot compensate for the speed at with these asteroids travel.  Moreover, the outer planets Jupiter, Saturn etc actually protect the Earth by "hurling" these space rocks away from us.

Amateur astronomers can view astroid 2015 HDI with an 8 inch or bigger telescope as it passes by the constellations Hydra, Antlia and Puppis with a magnitude of +13.2.  Enjoy the cosmic wonders if the weather in your area permits it.  




Source:



http://www.universetoday.com/119938/close-encounter-of-the-asteroid-kind-2015-hd1-skims-by-earth-tonight/

http://astronomynow.com/2015/01/17/asteroid-to-fly-close-by-earth-safely-on-26thjanuary/

Saturday, March 14, 2015

Saltwater Ocean in Ganymede

Based on a study entitled, "The Search for a Subsurface Ocean in Ganymede with Hubble Space Telescope Observations of its Auroral Ovals" publish by the Journal of Geophysical Research: Space Physics, NASA is reporting that Ganymede - one of Jupiter's moons and the largest in the solar system - may have a subterranean ocean of saltwater containing more water than the surface water found on Earth.
Ganymede is larger than both Mercury and Pluto, and is close to the size of Mars by three-quarters.  It was first observed by Galileo Galilei on January 7 in 1610 and was named after the mythology of a young boy who was taken to Olympus by the god Jupiter while under the form of an eagle.  This young boy which was said to be extremely beautiful would become a servant to the gods on Olympus.

The satellite has three layers with a metallic iron at the core which generates a magnetic field similar to that on Earth.  Around the core is a mantel and a shell of rock mostly comprised of ice.  Back in 1996, it was discovered by the Hubble Telescope that a thin layered atmosphere composed of oxygen existed on the moon.

However, this oxygen is not enough to support life as it exists here on Earth.  This does not mean life may have not evolved in a manner that matched the conditions found on the moon.  There may be life; microbes or more complex lifeforms which developed based on the conditions available.  Rock masses were discovered in 2004 under the icy terrain of Ganymede. The existence of these rock formations indicate the strength of the ice as it holds the rocks near the surface of the satellite and does not allow them to sink into the ocean believed to exist under the ice.

What is interesting is that Ganymede's magnetic field is intertwined with that of Jupiter's.  This causes a peculiar motion of the aurorae generated by both bodies which seems to sway.  Since salt is conductive, then another magnetic field would be visible over the area containing it as an interaction of forces takes place. This is what was discovered by the University of Cologne, Germany.  The magnetic field on Jupiter creates another field on Ganymede showing the presence of saltwater since the fields are interacting with the salt. This is described as "magnetic friction." The existence of this would hold back the swaying or rocking of the aurorae of both the moon and Jupiter. It is estimated that this saltwater ocean is about 65 miles across and about 10 times as deep as the oceans found on Earth  and is encrusted under 95 miles of ice.







Source:

http://onlinelibrary.wiley.com/doi/10.1002/2014JA020778/abstract;jsessionid=2A6AC3289B513AEE3667BF44E3135F36.f03t04

http://www.sciencedaily.com/releases/2015/03/150312112112.htm

http://news.sciencemag.org/space/2015/03/huge-ocean-confirmed-underneath-solar-system-s-largest-moon?utm_source=facebook&utm_medium=social&utm_campaign=facebook

http://www.space.com/28807-jupiter-moon-ganymede-salty-ocean.html?cmpid=514630_20150312_41984296&adbid=10152689951036466&adbpl=fb&adbpr=17610706465

http://hubblesite.org/newscenter/archive/releases/2015/09/full/

https://solarsystem.nasa.gov/planets/profile.cfm?Object=Jup_Ganymede

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