The world is watching as NASA tweaks the odds that asteroid 2024 YR4 will hit Earth. But how threatening is YR4, and how does it compare to other potentially hazardous space rocks?

While the asteroid's possibly collision with earth wouldn't be until 2032, there's been a lot of talk about the possibility in recent weeks.

The odds of asteroid 2024 YR4 striking Earth have fallen once again, now to 0.28%, NASA announced on Thursday.