Outer Space
Picture of the Week—Christmas Tree Cluster
If it is clear out tonight, grab your binoculars or a telescope and look up at the constellation of Monoceros, the Unicorn
Sixteen Years of Black Hole Watching Pays Off
How do you prove that a black hole exists? It is so dense, not even light can escape its grasp
From the Castle
Hello? Hello?
Life Beyond Earth
An ocean on Mars. An Earth-like planet light years away. The evidence is mounting, but are astronomers ready to say we're not alone?
Clues from a Comet
The first mission to collect space matter from beyond the moon offers insights into the solar system's creation
Celestial Sightseeing
From Triton's active geysers to the Sun's seething flares, newly enhanced images from U.S. and foreign space probes depict the solar system as never before
Look! Up in the Sky! It's a Bird! It's a Planet. It's a Very Large Ball of Ice!
It's Pluto, with its moon, Charon
Painted Ladies in Space
High schoolers ask: would metamorphosis aboard a space shuttle mission yield normal butterflies?
Casting a High-Tech Net for Space Trash
A cloud of spacecraft parts and debris envelops the earth. Keeping track of it takes the best we have
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