An asteroid at the upper boundary of that estimate is comparable in height to Chicago’s Sears Tower.
But even at the lower end of the estimate, the imposing space rock is large enough to threaten millions of innocent lives.
NASA said: “Potentially hazardous asteroids are about 150 meters – almost 500ft – or larger, roughly twice as big as the Statue of Liberty is tall.
“They approach Earth's orbit to within 7.5 million kilometres – about 4.6 million miles.
“By comparison, when Mars and Earth are at their closest, they are about 53 million kilometres – about 33 million miles – apart.”
“Potentially hazardous comets also get unusually close to Earth.”
2019-12-23 07:30:00Z
https://news.google.com/__i/rss/rd/articles/CBMihgFodHRwczovL3d3dy5leHByZXNzLmNvLnVrL25ld3Mvc2NpZW5jZS8xMjE5NzA4L0FzdGVyb2lkLXdhcm5pbmctTkFTQS10cmFja3MtaGF6YXJkb3VzLWFzdGVyb2lkLWJhcnJlbGluZy1FYXJ0aC1DaHJpc3RtYXMtYXN0ZXJvaWQtbmV3c9IBigFodHRwczovL3d3dy5leHByZXNzLmNvLnVrL25ld3Mvc2NpZW5jZS8xMjE5NzA4L0FzdGVyb2lkLXdhcm5pbmctTkFTQS10cmFja3MtaGF6YXJkb3VzLWFzdGVyb2lkLWJhcnJlbGluZy1FYXJ0aC1DaHJpc3RtYXMtYXN0ZXJvaWQtbmV3cy9hbXA?oc=5
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