News tagged with spitzer space telescope

The Cosmic Distance Scale

(PhysOrg.com) -- In 1908, Harvard astronomer Henrietta Swan Leavitt discovered that a class of stars called Cepheids have brightnesses that vary regularly with periods that are directly related to their intrinsic ...

dateJan 29, 2010 in Astronomy
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Surveying the X-ray Sky

(PhysOrg.com) -- Astronomers have only modest laboratories to probe the mysteries of the cosmos. Mostly they have to rely on meticulous and clever observations of remote phenomena.

dateJan 11, 2010 in Astronomy
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Centuries-Old Star Mystery Coming to a Close

(PhysOrg.com) -- For almost two centuries, humans have looked up at a bright star called Epsilon Aurigae and watched with their own eyes as it seemed to disappear into the night sky, slowly fading before coming ...

dateJan 05, 2010 in Astronomy
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NASA to launch sky-mapping spacecraft

(AP) -- NASA's latest space telescope will scan the sky in search of never-before-seen asteroids, comets, stars and galaxies, with one of its main tasks to catalog objects posing a danger to Earth. The sky-mapping ...

dateDec 06, 2009 in Astronomy
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The Energy Sources of Ultraluminous Galaxies

(PhysOrg.com) -- Ultraluminous infrared galaxies ((ULIRGs) are galaxies whose luminosity exceeds that of a trillion suns; for comparison, the Milky Way galaxy has a typical (and much more modest) luminosity ...

dateNov 27, 2009 in Astronomy
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Spitzer Telescope Observes Baby Brown Dwarf

(PhysOrg.com) -- NASA's Spitzer Space Telescope has contributed to the discovery of the youngest brown dwarf ever observed -- a finding that, if confirmed, may solve an astronomical mystery about how these ...

dateNov 23, 2009 in Astronomy
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