"We would not have any way to go and actively deflect one right now," warns the scientist who led NASA's DART mission.
Astronomers do not know where thousands of “city-killer” asteroids are, Nasa’s head of planetary defence has admitted.
The object is hurtling towards the Earth at a zippy 12,616 miles per hour, according to data from the space agency.
New plankton arrived just a few millennia — maybe even decades — after the Chicxulub asteroid, forcing a rethink of evolution ...
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