Through the early 1900s, astronomers disagreed on whether the universe was home to a multitude of galaxies, so-called “island universes,” or contained entirely within the boundaries of the ...

Astronauts aboard the International Space Station (ISS) orbit the Earth hundreds of miles above American soil. But that doesn’t mean they can’t vote while they float. NASA astronaut David Wolf ...

Every constellation has something within its borders worth tracking down, if you just look hard enough. Here are five to ...

Sixth test flight of the largest rocket to ever fly will feature another attempt at catching the Super Heavy booster and ...

Rainbows may be a trick of the eye, but they’re also based in fascinating optical physics. Here's how they work and why we ...

As the ISS ages and is eventually decommissioned, private companies may operate the orbital platforms of the future.

Mars’ features are starting to become visible, Mercury appears in the evening sky, and the Trifid Nebula glows in the sky ...

NASA has identified nine locations near the Moon’s south pole for the first crewed lunar landing since Apollo 17.

Insulation provided by carbon dioxide ice above the martian polar caps could explain many of the Red Planet’s ancient river features.

November’s major meteor shower ramps up as the Moon reaches perigee shortly before its Full phase in the sky this week.