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Latest Chandra X-ray Observatory Stories

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2006-08-30 16:30:00

A cosmic explosion seen last February may have been the "tip of an iceberg," showing that powerful, distant gamma ray bursts are outnumbered ten-to-one by less-energetic cousins, according to an international team of astronomers. A study of the explosion with X-ray and radio telescopes showed that it is "100 times less energetic than gamma ray bursts seen in the distant universe. We were able to see it because it's relatively nearby," said Alicia Soderberg, of Caltech, leader of the research...

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2006-08-30 15:50:00

Since 1999, a lot of things have come and gone -- the Y2K bug, a slew of boy bands and a new Star Wars trilogy. But NASA's Chandra X-ray Observatory, which unveiled its first images just a few months shy of the new millennium, continues to make headlines seven years later. Maybe it's because Chandra's subjects are timeless -- black holes, distant galaxies, and stars that don't reside in Hollywood. And they're long-lasting -- with stellar lives that span billions of years. Or maybe it's...

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2006-08-21 11:35:00

Dark matter and normal matter have been wrenched apart by the tremendous collision of two large clusters of galaxies. The discovery, using NASA's Chandra X-ray Observatory and other telescopes, gives direct evidence for the existence of dark matter. "This is the most energetic cosmic event, besides the Big Bang, which we know about," said team member Maxim Markevitch of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass. These observations provide the strongest evidence yet...

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2006-08-08 16:38:26

A critically important number that specifies the expansion rate of the Universe, the so-called Hubble constant, has been independently determined using NASA's Chandra X-ray Observatory. This new value matches recent measurements using other methods and extends their validity to greater distances, thus allowing astronomers to probe earlier epochs in the evolution of the Universe. "The reason this result is so significant is that we need the Hubble constant to tell us the size of the Universe,...

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2006-07-28 08:40:00

Scientists on a quest to find hidden black holes in the local universe have found surprisingly few. The observation implies that if these hidden black holes exist---and most scientists are convinced they do---they must be from the more distant, earlier universe, a concept that has interesting implications for galaxy evolution. This work constitutes the first census of the highest-energy part of the X-ray sky, where the most dust-enshrouded black holes are thought to shine. A team from NASA's...

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2006-06-21 15:55:00

Up to one quarter of the light brightening the universe comes from the massive crush of matter succumbing to the extreme gravity of black holes. Scientists have long understood that amount of light means black holes have the colossal appetite to ingest whole stars and huge amounts of gas. But a critical question has always remained: how they can continue to devour so much? For the first time, a team of scientists with NASA's Chandra X-ray Observatory led by Jon Miller has uncovered the...

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2006-06-20 15:23:23

New Haven, Conn. -- An international team of astronomers led by researchers at Yale has obtained key infrared observations that reveal the nature of quasar particle jets that originate just outside super-massive black holes at the center of galaxies and radiate across the spectrum from radio to X-ray wavelengths; a complementary study of jet X-ray emission led by astronomers at the University of Southampton, reaches the same conclusion. Both studies involve the jet of the quasar 3C273,...

2006-04-25 00:45:58

By Deborah Zabarenko WASHINGTON (Reuters) - Black holes turn out to be "green." These monstrous matter-sucking drains in space are the most fuel-efficient engines in the universe, researchers said on Monday. Just how efficient? If a car could use this kind of engine, it could theoretically go about a billion miles (1.6 billion km) on a gallon of gas, said Steve Allen of Stanford University in California. Unfortunately, no earthly car could do this, as black holes are fueled by...

2006-04-25 00:45:00

By Deborah Zabarenko WASHINGTON (Reuters) - Black holes turn out to be "green." These monstrous matter-sucking drains in space are the most fuel-efficient engines in the universe, researchers said on Monday. Just how efficient? If a car could use this kind of engine, it could theoretically go about a billion miles (1.6 billion km) on a gallon of gas, said Steve Allen of Stanford University in California. Unfortunately, no earthly car could do this, as black holes are fueled by matter lured by...

2006-04-24 19:45:00

By Deborah Zabarenko WASHINGTON - Black holes turn out to be "green." These monstrous matter-sucking drains in space are the most fuel-efficient engines in the universe, researchers said on Monday. Just how efficient? If a car could use this kind of engine, it could theoretically go about a billion miles (1.6 billion km) on a gallon of gas, said Steve Allen of Stanford University in California. Unfortunately, no earthly car could do this, as black holes are fueled by matter lured by the...


Latest Chandra X-ray Observatory Reference Libraries

7_d6897d09acee1dd0c34d0fbf62ff7d0b2
2004-10-19 04:45:44

X-Ray Astronomy -- Although the more energetic X-rays (E > 30 keV) can penetrate the air at least for distances of a few meters (they would never have been detected and medical X-ray machines would not work if this was not the case) the Earth's atmosphere is thick enough that virtually none are able to penetrate from outer space all the way to the Earth's surface. X-rays in the 0.5 - 5 keV range, where most celestial sources give off the bulk of their energy, can be stopped by a few...

2_a81834bec3c2c5679a2f649dd032460c2
2004-10-19 04:45:40

Chandra X-ray Observatory -- NASA's Chandra X-ray Observatory, which was launched and deployed by Space Shuttle Columbia on July 23, 1999, is the most sophisticated X-ray observatory built to date. Chandra is designed to observe X-rays from high-energy regions of the universe, such as the remnants of exploded stars. The Observatory has three major parts: (1) the X-ray telescope, whose mirrors focus X-rays from celestial objects; (2) the science instruments which record the X-rays so...

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