On the 95th anniversary of its discovery, Pluto remains one of the most beloved and enigmatic worlds in our solar system, ...

Last year, astronomers discovered an unusual Earth-size exoplanet they believe has a hemisphere of molten lava, with its ...

Galaxies, planets, black holes: to most people, everything about our Universe sounds and feels enormous. But while it's true ...

Saturn, Venus, Neptune, Uranus, Jupiter, Mars and Mercury will be visible in an uncommon planetary alignment this month.

For a brief moment at the end of February, every planet will appear in the night sky simultaneously in a rare celestial ...

Planet demographics reveal a puzzling lack of worlds in a certain size range throughout the galaxy F or centuries our solar system was the only planetary system known to humans. We had no proof other ...

Astrophysicists have been grappling with the question of how water arrived on our young planet for decades. One of the ...