The 1,115-foot-wide (340 meters) asteroid Apophis will pass closer to Earth than many satellites fly in April 2029, giving scientists and stargazers a rare front-row seat.

Astronomers say that mysterious interstellar visitors like 'Oumuamua and 3I/ATLAS are the most common large bodies in the Milky Way — and our best chance to study other planetary systems.

On Sept. 16, 1949, the U.S. launched a V-2 rocket with a monkey named Albert III on board.

Even though they're far from home, astronauts on the International Space Station still have normal routines, including getting regular haircuts.

With a modest amount of thrust and power, a new ion engine system could get rid of 1-ton pieces of space junk in less than 100 days. Here's how it works.