Space
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- Planets
A new look at Saturn’s rings
New information from space missions suggests Saturn's rings may be older and have more mass than scientists thought.
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- Planets
The trouble with Pluto
The traditional view of the solar system is out of date. Depending on who you talk to today, the answer to how many planets there are could be eight, 12, or even 208 and counting.
- Space
The solar system’s biggest junkyard
The science of tracking millions of pieces of garbage that orbit Earth is tricky and essential.
- Planets
The two faces of Mars
A single impact might explain why the Red Planet’s surface looks smoother in the north and rugged and rocky in the south.
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- Planets
Pluto, plutoid: What’s in a name?
In 2006, an international organization changed the classification of Pluto from planet to "dwarf planet."
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- Space
Ready, set, supernova
For the first time, scientists have caught a star in the act of exploding.
- Planets
Mercury unveiled
A new mission to Mercury is revealing surprising, never-before-seen details about the innermost planet.
