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 ...

A chunk of space rock ... smaller asteroids. If a lunar asteroid could be linked to a specific impact crater on the moon, studying it could unveil secrets about the pockmarked lunar surface.

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