Space
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Planets
Saturn’s Spongy Moon
Close-up views of Saturn's moon Hyperion reveal a strangely cratered surface that looks spongy.
By Emily Sohn -
Planets
An Icy Blob of Fluff
Firing a projectile into a comet has exposed an icy dirtball.
By Emily Sohn -
Planets
A Smashing Display
A space probe slams into a comet and sends up a mighty cloud of dust.
By Emily Sohn -
Space
World of Three Suns
A planet in the Milky Way tightly orbits the main star of a stellar trio.
By Emily Sohn -
Planets
Cousin Earth
Astronomers have found a solid, Earthlike planet just 15 light-years beyond the solar system.
By Emily Sohn -
Planets
Chaos Among the Planets
The screwball travels of four giant planets may have reshaped the early solar system.
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Space
Killers from Outer Space
A newly revised scale rates the risk that an asteroid may crash into Earth and wipe out life as we know it.
By Emily Sohn -
Planets
Solving a Sedna Mystery
Astronomers are learning more about the most-remote object known in the solar system.
By Emily Sohn -
Space
Return to Space
NASA is readying the space shuttle Discovery for its first launch in more than 2 years.
By Emily Sohn -
Space
Super star cluster in the neighborhood
Astronomers have spotted an amazingly compact grouping of stars in the Milky Way.
By Emily Sohn -
Space
No Fat Stars
Stars in the Milky Way can weigh no more than 150 times the sun's mass.
By Emily Sohn