Although all the exoplanets orbit closer than Mercury does to our Sun, liquid water may persist on some of them because their star radiates so little heat.
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Final Mirror Segment Added to Powerful Future Space Observatory
After years of planning, testing, and assembly, the James Webb Space Telescope, the world's largest infrared, space-based observatory, is taking shape.
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Jupiter's Europa Helps Earthlings See Sister Moon's Volcano
By briefly slipping between Earth and sister Jovian moon Io, Europa fortuitously enabled an Earth-based telescope to observe, with greater detail than ever before, a huge, puzzling volcano on Io.
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Scientists Find "Close Cousin" of Earth
The Kepler space telescope spots a planet in a solar system 1400 light years away that closely resembles Earth in its size, distance from its star, and the type of star it orbits.
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Hubble's Legacy: The Pillars of Creation
The Pillars of Creation remains to this day Hubble's most iconic view of the cosmos.