Asteroids

New NASA images of a mountain-size, "planet killer" asteroid that made its closest approach to Earth last month have revealed a surprise companion circling the massive space rock.

New photos of the recently discovered asteroid 2024 MK, which zoomed past Earth in late June, reveal that the massive space rock's orbit has been significantly altered by its close approach to our planet.

On Saturday (June 29), an asteroid larger than the Great Pyramid of Giza will fly past Earth at about three-quarters the distance from Earth to the moon. The asteroid, named 2024 MK, poses no risk to our planet.

Shorty after 4 p.m. ET today (June 27), the mountain-size asteroid 2011 UL21 will come within 5 million miles of Earth, making it one of the largest space rocks to come that close to our planet for 125 years. Here's how to watch the close encounter live, or see it with a telescope.

Experts from NASA and other international organizations recently simulated their response to a hypothetical asteroid impact scenario. The test was deemed a success. However, several media outlets have misreported the group's findings.

Researchers have proposed a model for how a double moon named Selam formed around the tiny asteroid Dinkinesh. This is the first 'contact binary' moon ever discovered, scientists say.

Scientists have calculated the rotational speed of asteroid 2024 BX1, which exploded over Berlin earlier this year, by letting it trail in images of the sky. It turns out, 2024 BX1 was spinning faster than any other near-Earth object ever seen.

Artificial intelligence trained by asteroid-hunting citizen scientists helped identify more than 1,000 never-before-seen solar system objects from old Hubble images spanning two decades.

The near-Earth asteroid Kamo'oalewa, which orbits alongside our planet as a 'minimoon,' may have originated from Giordano Bruno crater on the far side of the moon, new research suggests.