An asteroid known as 2024 YR4 won't be crashing into Earth, but the James Webb Space Telescope went to get a look at it anyway. Here's what it found.

A “city killer” asteroid experts feared was on a crash course with Earth is now expected to miss the planet — but it still has a chance of smashing into the moon.

A huge asteroid that was briefly feared to strike Earth now has a nearly 4% chance of smashing into the moon, according to new data from the James Webb Space Telescope.