NASA's top planetary defense expert reveals the biggest threat isn't Hollywood-style doomsday rocks, but undiscovered 'city-killer' asteroids. While large and small threats are known, an estimated 25, ...

I break down scientific models showing what could happen if a large asteroid struck Earth.

The MUSE instrument on ESO’s Very Large Telescope (VLT) monitored asteroid Dimorphos post-NASA DART impact. See the evolution of the debris cloud created by the smash-up over the course of a month; ...

A planetary defense expert working for NASA warned that humanity has no defense against up to 15,000 undetected near-Earth asteroids that could wipe out a city.

NASA planetary defense experts warn that up to 15,000 undetected asteroids could devastate a major city on Earth.

NASA's head of planetary defence, Dr Kelly Fast, has issued an unsettling update on thousands of ‘city-killer’ asteroids that could hit Earth.

"We don’t know where they are,” said NASA’s planetary defense officer Kelly Fast at the AAAS conference in Arizona this week.

NASA scientists recently expressed alarm over the potential threat posed by approximately 15,000 undetected asteroids capable ...

NASA planetary defense experts report that mid-size near-Earth asteroids could cause regional damage, with detection and deflection remaining limited, according to New York Post and AAAS reports.

A top astronomer responsible for defending the Earth against asteroids has revealed what keeps her up at night — thousands of “city killer” space rocks that remain undetected. Dr Kelly Fast, NASA’s ...

Scientists estimate that around 15,000 medium-sized asteroids — large enough to devastate a city — remain undetected within ...

A viral claim about Earth losing gravity for seven seconds in 2026 has been debunked by scientists. Learn why this sensational story is a hoax.