Whatever dark energy is, explanations for it have less wiggle room following a Hubble Space Telescope observation.
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NASA studies the universe from the smallest particles of matter and energy to the biggest questions of the evolution and structure of the cosmos.
Latest Features
Refined Hubble Constant Narrows in on Dark Energy
NASA's Wide Field and Planetary Camera 2
Throughout history, humanity has been moved by the work of the great artists of their age.
NASA's Spitzer Telescope Warms Up To New Career
The primary mission of NASA's Spitzer Space Telescope is about to end after more than five-and-a-half years of probing the cosmos with its keen infrared eye.
More Features
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Top Five Breakthroughs From Hubble's Workhorse Camera
Here are five things you should know about JPL's Wide Field and Planetary Camera 2, which is the oldest and longest working instrument aboard the Hubble Space Telescope.
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Herschel and Planck Share Ride to Space
Two missions to study the cosmos are scheduled to blast into space May 14 aboard the same rocket from the Guiana Space Center in French Guiana.
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Stellar Shots: JPL's Camera on Hubble
JPL's Wide Field and Planetary Camera 2, which will be returned to Earth as part of the next space shuttle servicing mission, scheduled to launch on May 11, 2009, took some of Hubble's most famous views.
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NASA's Fermi Explores High-energy "Space Invaders"
Fermi scientists revealed new details about high-energy particles implicated in a nearby cosmic mystery.
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If Spitzer Could Talk: An Interview with a Telescope
NASA's Spitzer Space Telescope is about to use its last drop of the coolant that has chilled it for the past five-and-a-half years.
Latest News Releases
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NASA Television to Provide HD Coverage of Space Shuttle Launch
05.06.09 - NASA Television will provide live high definition coverage of Monday's scheduled launch of space shuttle Atlantis on its STS-125 mission to upgrade the Hubble Space Telescope.
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NASA's Spitzer Telescope Warms Up to New Career
05.6.09 - The primary mission of NASA's Spitzer Space Telescope is about to end after more than five and a half years of probing the cosmos with its keen infrared eye.
 "Close-up of an astronaut's hand removing screws from the cover of STIS with the fastener capture plate")
 "Hubble Space Telescope")
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NASACast: Universe
Audio and video podcasts on NASA missions looking for answers deep into the cosmos.