A recently discovered celestial body is rewriting our knowledge of the Kuiper Belt and maybe challenging the existence of the ...

The International Astronomical Union, which reclassified Pluto as a dwarf planet in 2006, is the arbiter of such classifications. Andrea has written about NASA and the commercial space sector ...

Farther out, its debris disk is similar to our solar system's Kuiper Belt, where dwarf planets, comets, and other bits of ice and rock are found (and sometimes collide with one another).

SpaceX is developing the fully reusable vehicle — the biggest and most powerful rocket ever built — to help humanity settle the Red Planet, a long-held dream of Musk's. SpaceX has not ...

Astronomers have discovered a freezing-cold world orbiting within the so-called "forbidden zone" around a dying star in which planets are normally destroyed. The 5.8-billion-year-old white dwarf ...

Science textbooks may be in for another revision. Our solar system shrank from nine planets to eight after the International Astronomical Union demoted Pluto in 2006. But there may yet be ...

Experts said ahead of time that some if not all of it might come crashing down, given it was built to withstand a landing on Venus, the solar system’s hottest planet. The Venus 7 probe ...

A perfect time to explore the lunar maria. May's full moon, known as the 'Flower Moon' is set to dazzle stargazers and the astrophotography community alike when it rises on the night sky on May 12.

They lie about 250 astronomical units from a third brown dwarf, making the system even more complex. Adding a planet to this picture only deepens the mystery. The system belongs to the Argus ...

(Exoplanets are defined as any planet beyond our solar system.) Don't expect to travel there any time soon. It's 244 light-years away from the Earth -- for comparison, the dwarf planet Pluto is ...