NASA warns that more than 15,000 asteroids capable of destroying cities remain undetected and that Earth has no defense against impact.

More than half of the near-Earth objects large enough to destroy a city have never been spotted by any telescope on or off the planet. NASA estimates the total population of these objects at roughly ...

The refined observations from last month eliminate chances of impact, and provide a flyby distance.

A 140-foot asteroid is set to sweep past Earth today, and it seems everyone is taking notice. Astronomers have been tracking the space rock, officiall.

Add Yahoo as a preferred source to see more of our stories on Google. A planetary defense specialist is cautioning that humanity remains unprotected against as many as 15,000 near-Earth asteroids that ...

Space agencies maintain that global cooperation and sustained investment are vital to planetary defence. While the DART ...

Add Yahoo as a preferred source to see more of our stories on Google. Dr. Kelly Fast, NASA’s acting planetary defense officer, said the greatest threat comes from asteroids that haven’t yet been ...

NASA's Jet Propulsion Laboratory reports that the near-Earth asteroid 2021 ER will approach Earth on Friday for a safe yet close flyby. The asteroid is roughly 44 feet wide, which equals the ...

A fast-moving asteroid called 2026 DG7 is set to pass relatively close to Earth. Scientists say it poses no danger, but the event is drawing attention from space agencies worldwide. Why?

NASA officials warn thousands of undetected “city killer” asteroids may be circling near Earth. With limited deflection tools ready, are we prepared if one suddenly shifts onto a collision course?

The next asteroid won’t come with a warning siren. What happens after it’s discovered could determine everything.

Bruce Willis and Ben Affleck stopped a Texas-sized asteroid from crashing into the Earth in the 1998 science-fiction movie “Armageddon.” But a NASA expert said recently the greatest concern isn’t the ...