For more than half a century, tiny tubes of gray lunar dirt scooped up by Apollo astronauts have been sitting in NASA vaults.

A viral social media post shared thousands of times warned of an “exploding tree risk” as temperatures in the Northern Plains and Great Lakes are set to plunge below zero. But experts say the dramatic ...

Dark matter is a ghostly substance that astronomers have failed to detect for decades, yet which we know has an enormous influence on normal matter in the universe, such as stars and galaxies. Through ...