When comet Holmes unexpectedly erupted in 2007, professional and amateur astronomers around the world turned their telescopes toward the spectacular event.
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Hubble Servicing Mission 4
Shuttle astronauts return to extend the life of the famed observatory
Science Mission Directorate
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
NASA's Spitzer Gets Sneak Peak Inside Comet Holmes
Splashy Portrait Helps Explain How Stars Form
Different wavelengths of light swirl together like watercolors in a new, ethereal portrait of a bright, star-forming region.
A Quest for Astronomy's 'Holy Grail'
Sarah Seager hopes her exoplanet research will help "complete the Copernican Revolution."
More Features
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Celebrating 10 Years of Hubble Heritage Images
The landmark 10th anniversary of the Hubble Space Telescope's Hubble Heritage Project is being celebrated with a "landscape" image from the cosmos.
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Infrared Echoes Give Spitzer a Supernova Flashback
Hot spots near the shattered remains of an exploded star are echoing the blast's first moments, say scientists using data from NASA's Spitzer Space Telescope.
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A Star That Bursts, Blinks and Disappears
Astronomers are reporting on a strange case where one of the littlest of stars "twinkled" with gamma rays, X-rays, and light -- and then vanished.
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Diversity in Galaxies
There's an old saying in astronomy: Galaxies are like people. They're only normal until you get to know them.
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Sunspots Pump Plasma Into Interplanetary Space
Scientists find that dim areas at the edges of active sunpot regions may hold the key to the sun's energy processes.
Latest News Releases
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NASA to Provide Update to Hubble Anomaly Status
10.10.08 - NASA will host a media teleconference at 12:30 p.m. EDT, Tuesday, Oct. 14, to brief reporters about the status of efforts to revive the data handling unit that failed on the Hubble Space Telescope in late-September.
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NASA to Provide Mars Science Laboratory Launch Update
10.9.08 - NASA will host a media teleconference at 3 p.m. EDT, Friday, Oct. 10, to brief reporters after a meeting held by the agency's administrator concerning the Mars Science Laboratory, or MSL.
 "image from space of the sun rising against Earth's horizon")
 "artist's rendering of ACS Repair")
Podcasts
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NASACast: Universe
Audio and video podcasts on NASA missions looking for answers deep into the cosmos.