Scientists believe that two asteroids might be fragments of long-lost "planetary embryos" from the early solar system.

The closest of the asteroids to us—estimated to be about the size of a car—is whizzing through space at 27,358 miles per hour.

Should any asteroids ever do pose a serious threat to Earth, the world's space agencies have for years begun to build a planetary defense against dangerous space rocks. "We aren’t just waiting ...

The space rock is formally named 2024 YR4. Scientists say it currently carries a 2% risk of making contact with Earth when it eventually reaches this part of the solar system on Dec. 22 ...

The chance of a newly discovered space rock hitting Earth in about eight ... scientists infer the size of asteroids from the amount of light they reflect, which also depends on their composition.

This 12-foot-wide space rock has not come this close since 2013 and is expected to make another flyby in January 2033. The other two asteroids, 2025 CD and 2025 CE, are larger, measuring 22 feet ...

JPL scientists continue to track multiple asteroids near Earth. Although these pose no threat, their study is important. Close encounters like these help in understanding space rocks better.