Scientists Find Evidence of an Ocean Deep Inside Pluto
Reddish deposits of ammonia on Pluto suggest that liquid water, the key to life as we know it, exists below its surface.
How to Survive April's Three—Yes, Three!—Retrogrades
Jupiter, Pluto, and Saturn begin their retrogrades this month—but our resident astrologer is here to help.
We May Have Identified What Lies at the Outermost Edge of Our Solar System
New Horizons is the first spacecraft in nearly three decades to observe what appears to be evidence of a hydrogen wall at the edge of the heliosphere.
This Is the Closest You’ll Get to Pluto For Now
NASA has now put together 100 color photos to show what it would be like to land on the dwarf planet.
Pluto Likely Has an Ocean of Water Deep Under Its Surface
The thick, viscous ocean is right beneath its icy heart.