Space
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- Space
Supernovas Shed Light on Dark Energy
Astronomers have new evidence that something called dark energy is revving up the expansion of the universe.
- Planets
Evidence of a Wet Mars
An orbiter provides new details about when and where liquid water existed on Mars.
- Space
Gravity Tractor as Asteroid Mover
A huge spacecraft could use its gravity to keep an asteroid from hitting Earth.
- Planets
Pluto’s New Moons
Astronomers have spotted two objects that may be previously unknown moons of Pluto.
- Planets
Saturn’s Spongy Moon
Close-up views of Saturn's moon Hyperion reveal a strangely cratered surface that looks spongy.
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- Planets
Cousin Earth
Astronomers have found a solid, Earthlike planet just 15 light-years beyond the solar system.
- Planets
Chaos Among the Planets
The screwball travels of four giant planets may have reshaped the early solar system.
