The asteroid is a bit larger than the Pyramids at Giza, Egypt. Even at this size, the asteroid can pose a great threat to life on Earth. At the speed it is traveling, it can cause a catastrophic collision that can cause atomic-like shock waves that can wipe out cities and cause dust to block the Sun in the atmosphere which will bring plant life to die and those that depend on it. This will be a chain reaction of death which is believed to what have caused the extinction of the dinosaurs.
However, there is no need for alarm. Asteroids like this pass by Earth all the time. Many times, they are not even noticed until they have already passed by! Earth is protected by the larger planets Jupiter and Saturn. Their large masses allow for a stronger gravitational pull which slings asteroids away from the Earth.
Source:
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2016%20NF23&orb=1
https://www.newsweek.com/nasa-says-500-foot-wide-asteroid-approaching-earth-potentially-hazardous-1087509?utm_medium=Social&utm_source=Twitter&utm_campaign=NewsweekTwitter
https://metro.co.uk/2018/08/23/nasa-spacecraft-prepares-for-close-encounter-with-huge-asteroid-that-could-hit-earth-next-century-7874962/?ito=article.amp.share.top.twitter
https://www.dailystar.co.uk/news/world-news/725687/nasa-news-asteroid-space-rock-2016-nf23-great-pyramid-of-giza-in-egypt
https://www.thesun.co.uk/tech/7101910/potentially-hazardous-asteroid-bigger-than-statue-of-liberty-heading-for-earth/
https://www.space.com/41618-asteroid-2016-nf23-no-threat-to-earth.html
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