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Latest Chandra X-ray Observatory Stories

4f9d61d0961c6b54b67f625e5af170121
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,...

31f2a075ca146ec607bd2a7cd602ce391
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...

c613fdf595cc7bab98037d27030398ac1
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...

dc8e2ac197f316bf9c3c765bf2adebee1
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...

722ad92ba6c60166c3dbeec7c4c75c411
2006-04-06 00:40:00

A pair of supermassive black holes in the distant universe are intertwined and spiraling toward a merger that will create a single super-supermassive black hole capable of swallowing billions of stars, according to a new study by astronomers at the University of Virginia, Bonn University and the U.S. Naval Research Laboratory. The study appears in the April 6, 2006 issue of the journal Astronomy & Astrophysics. Black holes are among the oldest regions of the universe and hold clues to...

18b8288224d490daa0a1e3c02a50c3041
2006-03-23 07:23:11

NASA -- Scientists using NASA's Chandra X-ray Observatory have detected an extensive halo of hot gas around a quiescent spiral galaxy. This discovery is evidence that galaxies like our Milky Way are still accumulating matter from the gradual inflow of intergalactic gas. "What we are likely witnessing here is the ongoing galaxy formation process," said Kristian Pedersen of the University of Copenhagen, Denmark, and lead author of a report on the discovery. Chandra observations show that the...

523f17746df2306fcd5d89d4aebeeb311
2006-01-24 23:45:00

ESA -- XMM-Newton, ESA's X-ray observatory, continues its quest for the unknown. This month, after five years of operations, the mission saw the publication of its 1000th scientific paper, corresponding to an equivalent number of results, in top-class scientific journals. This is not the only record-breaking figure for this X-ray 'hunter' mission. There are several ways to measure the scientific success of a mission. One is certainly to look at the use the scientific community makes of...


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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Word of the Day
penuche
  • A fudgelike confection of brown sugar, cream or milk, and chopped nuts.
'Penuche' is a variant of 'panocha,' a coarse grade of sugar made in Mexico. 'Panocha' probably comes from the Spanish 'panoja, panocha,' ear of grain.
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