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.

According to a memo from the Department of the Navy obtained by ABC 10News, a stop-work order was issued last week to Marine ...

Pluto isn't alone—it's part of the Kuiper Belt with possibly hundreds of other planet-sized objects. Because Pluto hasn't ...

The article humorously ranks planets based on wealth, characterizing Jupiter as the richest due to its massive size and possessions, and Mars as a str ...

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

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

A comical planetary beauty contest is described, highlighting the unique traits of each planet: Mercury’s fiery nature, Venus ...

The "Star Trek" legend's only son will discuss his memoir at the annual space-themed event.

Scientists at NASA for the first time have been able to observe the make up of Pluto and other small and icy celestial bodies ...

Trans-Neptunian objects (TNOs) are icy bodies that vary widely in size, from large dwarf planets like Pluto and Eris—each ...

Explore Ceres, the largest asteroid in our solar system, and discover its remarkable ancient ocean and ice-rich crust.