The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Does our Solar System have 9 planets or only 8? Astronomers have gone back and forth on that a lot, with Pluto now being classified as a dwarf planet. However, out beyond Neptune there could be ...

The organic material found in a few areas on the surface of dwarf planet Ceres is probably of exogenic origin. Impacting ...

Why is Pluto no longer a planet? Discover the real reason behind Pluto’s reclassification as a dwarf planet and the science that led to this change.

Using the Keck Planet Imager and Characterizer (KPIC), astronomers have performed high-resolution spectroscopic observations ...

These popular astronomy questions, answered by Astronomy magazine, will help you better understand our universe - and share ...

In August 2006, the International Astronomical Union made the controversial, but correct, decision to demote Pluto from its ...

The building blocks of life could have been delivered to Ceres by one or more space rocks from the outer asteroid belt.

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

The dwarf planet is a bizarre ... a group of researchers led by the Max Planck Institute for Solar System Research (MPS) in Germany presents the most comprehensive analysis to date of this ...

Alongside Pluto, Eris was also classified as a dwarf planet under the new criteria ... a better understanding of the structure of our solar system and has opened the door for further studies ...

Take advantage of a special 6-7 planet alignment from Earth's perspective. Planets 'line up' in the skies over California in ...