Data collected by NASA's InSight lander suggest that ancient internal processes are responsible for the "Martian dichotomy" ...

Since the dawn of the science of warfare, when the battle became more than two groups simply slogging it out until one is annihilated, armies have long recognized the importance of capturing the high ...

Mars will appear to make an ultraclose approach to the moon on Sunday, after Jupiter had a turn earlier this week. Here's how to get the best view of the rare conjunction.

Scientists using the Hubble Space Telescope have spotted a record-smashing galaxy wrapped in 9 rings of stars — along with ...

From planets and constellations, to eclipses and the Aurora Borealis, here's what to look for in the sky this spring ...