One of Earth’s deepest mysteries lies beneath our feet: the planet’s inner core. Made of iron and nickel, the hot, solid sphere is about 70% the size of the moon. Recent research suggested this dense ...

A recently discovered asteroid, named 2024 YR4, has on average a 2% chance of hitting Earth in 2032. While those odds of an impact are slim, astronomers are closely tracking the space rock to uncover ...