NASA's Perseverance Mars rover found a 'one-of-a-kind treasure' on the rim of Jezero Crater, a rock that could help reveal the ancient history of the Red Planet.

On June 27, the mountain-size asteroid 2011 UL21 will come within 5 million miles of Earth, making it one of the largest space rocks to come that close to our planet for 125 years. Here's how to ...