In late 2024, astronomers spotted asteroid 2024 YR4 on a trajectory that could potentially threaten Earth. This observation triggered a fervid series of observations of the object — possibly as big as ...

This post was updated at 11:23 p.m. Amy Mainzer didn’t plan on studying asteroids when she graduated from her doctoral program in 2003. But now, Mainzer – who received her doctorate of astronomy from ...