A July flyby of a massive asteroid went undetected until two days after it passed, raising urgent questions about planetary defense.

While most of them are small and disappear in the atmosphere, some of them come alarmingly close to our planet. While ...

A small asteroid, known as 2025 TF, flew over Antarctica on October 1, 2025, at an altitude of only 266 miles.

A small asteroid just gave the Earth a close buzz. The little space rock, called 2025 TF, safely passed within roughly 250 miles (400 km) of our planet on Tuesday (Sept. 30) at 8:49 p.m. EDT ...

On October 31, 2015, an asteroid shaped like a human skull flew by Earth. It arrived with excellent timing on Halloween, ...

There are many programs that detect near-Earth asteroids as part of countries' planetary defense strategies. In the case of ...

A newly discovered asteroid just whizzed past Earth, marking the second-closest asteroid flyby on record, astronomers say. The asteroid flew over Antarctica just before 9 p.m. ET on Sept. 30, about ...

PHILADELPHIA -- An asteroid named for the Egyptian god of chaos and darkness won't be wreaking any havoc on Earth -- at least not this century. That's the good news from NASA's Center for Near-Earth ...

Although it won’t hit Earth, an asteroid once labeled a “city killer” is now back in the spotlight — this time, because it might hit the moon. KTLA spoke with Davide Farnocchia, a navigation engineer ...

It's not unusual to have small asteroids pass closer to the Earth than the moon's distance of 240,000 miles. Matter of fact, the house-sized 2011 UX255 buzzed only 96,000 miles from our planet last ...

Diagram showing the orbit of 2014 KH39. Yellow shows the portion of its orbit above the plane of Earth's orbit (grey disk); blue is below the plane. When farthest, the asteroid travels beyond Mars ...