The asteroid, about the size of a 10-story building, has a 4.3% chance of lunar impact, according to NASA's James Webb Space Telescope observations. While a moon impact wouldn't significantly alter ...

Earth is perfectly safe from a menacing asteroid known as 2024 YR4 that is big enough to level a city, but the moon? Not so much.

Dawn didn’t just observe Vesta’s giant craters - it mapped the asteroid’s interior and detected signs of a once-active molten core. At Ceres, its spectrometers found ammonia-rich clays and carbonates, ...