How big would a telescope need to be to see Earth’s dinosaurs from 66 million light-years away? Think big—and then think ...
Asteroid 2024 DW flew about 139,000 miles (224,000 km) away from Earth. The space rock was estimated to be about 43 feet wide (13 m). Credit: Space.com | animation: NASA/JPL-Caltech | edited by Steve ...
"We would not have any way to go and actively deflect one right now," warns the scientist who led NASA's DART mission.
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