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

When astronomers found a large world farther out than Pluto, it became one of the final nails in the coffin of our ninth ...

While Charon is currently listed as a satellite or moon by the International Astronomical Union (IAU), consideration is being given to it perhaps being classified as a dwarf planet in its own right, ...

University of Arizona researchers have unveiled evidence of romance at the farthest reaches of the solar system: a cosmic ...

Scientists have discovered a new type of planetary collision called “kiss-and-capture,” where Pluto and proto-Charon briefly ...

This provides another piece of the puzzle to understand how planets and ... Pluto-Charon Formation Scenario ... a clearer picture of how the outer solar system formed and evolved based on analyses ...

Stargazers, prepare for the parade of planets that will take place over the next few nights in the sky. Here's what you need to know.

Charon is unusual because it is the largest moon in the solar system compared with its parent body. In fact, Charon and Pluto are so similar in size that they are considered a double dwarf planet ...

Venus, Mars, and even Jupiter were visited decades ago. So why did it take so long for a mission to reach Mercury? 🌞 This video explores the surprising obstacles that make this tiny planet one of the ...

Researchers accounted for the previously overlooked structures of the dwarf planet and moon in computer simulations of a ...

If it’s real, some may question whether something with a mass about three times Pluto’s counts as a planet at all.