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Three mysterious objects were shot out of North American skies in a three-day period. They're UFOs, but that doesn’t mean they were sent by aliens.

A planetary defense exercise used asteroid Apophis as hazardous asteroid stand-in. Over 100 participants from 18 countries – including University of Arizona scientists and NASA's UArizona-led NEOWISE mission – took part in the international exercise.

Asteroid 2001 FO32 will be passing by Earth at the extremely safe distance of 2 million kilometers on Sunday

The largest asteroid to pass by Earth this year will approach within some 1.25 million miles (two million kilometers) of our planet on March 21, NASA said Thursday.

Large asteroid to pass by Earth on March 21 — NASA Published March 12, 2021 8:32am The largest asteroid to pass by Earth this year will approach within some 1.25 million miles (two million kilometers) of our planet on March 21, NASA said Thursday. The US space agency said it will allow astronomers to get a rare close look at an asteroid. The asteroid, 2001 FO32, is estimated to be about 3,000 feet in diameter and was discovered 20 years ago, NASA said. "We know the orbital path of 2001 FO32 around the Sun very accurately," said Paul Chodas, director of the Center for Near Earth Obje...