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NEWS FROM SPACE!

Photo description:The newly discovered star RXJ 1856 is too small for standard models.

NASA's Chandra X-ray Observatory has found two stars ? one too small, one too cold ? that reveal cracks in our understanding of the structure of matter. These discoveries open a new window on nuclear physics, offering a link between the vast cosmos and its tiniest constituents.

Photo: Newly discovered star RXJ 1856 is too small for standard models. (NASA et al.)

Chandra?s observations of RXJ1856.5-3754 and 3C58 suggest that the matter in these stars is even denser than nuclear matter found on Earth. This raises the possibility these stars are composed of pure quarks or contain crystals of sub-nuclear particles that normally have only a fleeting existence following high-energy collisions.

By combining Chandra and Hubble Space Telescope data, astronomers found that RXJ 1856 radiates like a solid body with a temperature of 1.2 million degrees Fahrenheit (700,000 degrees Celsius) and has a diameter of about 7 miles (11.3 kilometers). This size is too small to reconcile with standard models for neutron stars ? until now the most extreme form of matter known.

?Taken at face value, the combined observational evidence points to a star composed not of neutrons, but of quarks in a form know as strange quark matter,? said Jeremy Drake of the Harvard-Smithsonian Center for Astrophysics (CfA) in Cambridge, Mass., and lead author of a paper on RXJ1856 to appear in June 20, 2002 issue of The Astrophysical Journal. ?Quarks, thought to be the fundamental constituents of nuclear particles, have never been seen outside a nucleus in Earth-bound laboratories.?

Observations by Chandra of 3C58 also yielded startling results. A team composed of Patrick Slane and Steven Murray, also of CfA, and David Helfand of Columbia University, New York, failed to detect the expected X-radiation from the hot surface of 3C58, a neutron star believed to have been created in an explosion witnessed by Chinese and Japanese astronomers in 1181 AD. The team concluded that the star has a temperature of less than one million degrees Celsius, which is far below the predicted value.

?Our observations of 3C58 offer the first compelling test of models for how neutron stars cool and, the standard theory fails,? said Helfand. ?It appears that neutron stars aren't pure neutrons after all ? new forms of matter are required.?

A teaspoonful of neutron star material weighs a billion tons, as much as all the cars, trucks and buses on Earth. Its extraordinary density is equivalent to that of the nucleus of an atom with all of the typical space between the atoms and their nuclei removed. An atom?s nucleus is composed of positively charged protons and neutral neutrons, particles so small that 100 billion trillion of them would fit on the head of a pin.

Protons and neutrons are composed of even smaller particles called quarks, the basic building blocks of matter. Enormous atom smashers are designed to probe the forces between quarks and the structure of the nucleus by smashing high-energy beams of nuclei into each other and observing the violent aftermath for a fraction of a second.

Drake cautioned that the observations of RXJ1856 could be interpreted as a more normal neutron star with a hot spot. Such a model is under consideration by Fred Walter of the State University of New York, Stony Brook, one of the discoverers of RXJ1856, which was originally found in 1996 by the German Roetgen satellite. However, the hot spot model requires a very special orientation of the star with respect to the Earth to explain the absence of pulsations, which would be expected from the hot spot. The probability of such an orientation is quite small.

?Regardless of how these mysteries are resolved, these precise observations are highly significant,? said Michael Turner of the University of Chicago. ?They demonstrate our ability to use the universe as a laboratory where we can study some of the most fundamental questions in physics.?

NASA's Marshall Space Flight Center in Huntsville, Ala., manages the Chandra program, and TRW, Inc., Redondo Beach, Calif., is the prime contractor. The Smithsonian's Chandra X-ray Center controls science and flight operations from Cambridge, Mass.

Images and additional information about this result are available at:

http://chandra.harvard.edu/ AND
http://chandra.nasa.gov/

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Welcome, TO eagal14u-PAGES AT Yahoo! GeoCities YOU ARE now at: http://www.geocities.com/eagal14u/EagalSpirit/XRAY-CHANDR.HTML

HARDVARD SPACE ED.U

TAKE A LOOK ARROUND FOR A LITTLE rocket science

TRY THIS SEARCH FOR MORE ODD SPACY DATA NEWS AND OUTLOOKS FOR 2000+...

Google
sky and telescope .com http://skyandtelescope

image storage(free)MakePosters(a charge)

NEWS FROM SPACE!

Photo description:The newly discovered star RXJ 1856 is too small for standard models.

NASA's Chandra X-ray Observatory has found two stars ? one too small, one too cold ? that reveal cracks in our understanding of the structure of matter. These discoveries open a new window on nuclear physics, offering a link between the vast cosmos and its tiniest constituents.

Photo: Newly discovered star RXJ 1856 is too small for standard models. (NASA et al.)

Chandra?s observations of RXJ1856.5-3754 and 3C58 suggest that the matter in these stars is even denser than nuclear matter found on Earth. This raises the possibility these stars are composed of pure quarks or contain crystals of sub-nuclear particles that normally have only a fleeting existence following high-energy collisions.

By combining Chandra and Hubble Space Telescope data, astronomers found that RXJ 1856 radiates like a solid body with a temperature of 1.2 million degrees Fahrenheit (700,000 degrees Celsius) and has a diameter of about 7 miles (11.3 kilometers). This size is too small to reconcile with standard models for neutron stars ? until now the most extreme form of matter known.

?Taken at face value, the combined observational evidence points to a star composed not of neutrons, but of quarks in a form know as strange quark matter,? said Jeremy Drake of the Harvard-Smithsonian Center for Astrophysics (CfA) in Cambridge, Mass., and lead author of a paper on RXJ1856 to appear in June 20, 2002 issue of The Astrophysical Journal. ?Quarks, thought to be the fundamental constituents of nuclear particles, have never been seen outside a nucleus in Earth-bound laboratories.?

Observations by Chandra of 3C58 also yielded startling results. A team composed of Patrick Slane and Steven Murray, also of CfA, and David Helfand of Columbia University, New York, failed to detect the expected X-radiation from the hot surface of 3C58, a neutron star believed to have been created in an explosion witnessed by Chinese and Japanese astronomers in 1181 AD. The team concluded that the star has a temperature of less than one million degrees Celsius, which is far below the predicted value.

?Our observations of 3C58 offer the first compelling test of models for how neutron stars cool and, the standard theory fails,? said Helfand. ?It appears that neutron stars aren't pure neutrons after all ? new forms of matter are required.?

A teaspoonful of neutron star material weighs a billion tons, as much as all the cars, trucks and buses on Earth. Its extraordinary density is equivalent to that of the nucleus of an atom with all of the typical space between the atoms and their nuclei removed. An atom?s nucleus is composed of positively charged protons and neutral neutrons, particles so small that 100 billion trillion of them would fit on the head of a pin.

Protons and neutrons are composed of even smaller particles called quarks, the basic building blocks of matter. Enormous atom smashers are designed to probe the forces between quarks and the structure of the nucleus by smashing high-energy beams of nuclei into each other and observing the violent aftermath for a fraction of a second.

Drake cautioned that the observations of RXJ1856 could be interpreted as a more normal neutron star with a hot spot. Such a model is under consideration by Fred Walter of the State University of New York, Stony Brook, one of the discoverers of RXJ1856, which was originally found in 1996 by the German Roetgen satellite. However, the hot spot model requires a very special orientation of the star with respect to the Earth to explain the absence of pulsations, which would be expected from the hot spot. The probability of such an orientation is quite small.

?Regardless of how these mysteries are resolved, these precise observations are highly significant,? said Michael Turner of the University of Chicago. ?They demonstrate our ability to use the universe as a laboratory where we can study some of the most fundamental questions in physics.?

NASA's Marshall Space Flight Center in Huntsville, Ala., manages the Chandra program, and TRW, Inc., Redondo Beach, Calif., is the prime contractor. The Smithsonian's Chandra X-ray Center controls science and flight operations from Cambridge, Mass.

Images and additional information about this result are available at:

http://chandra.harvard.edu/ AND
http://chandra.nasa.gov/

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www.sciam.comFebruary 2004 issue The Cosmic Symphony New observations of the cosmic microwave background radiation show that the early universe resounded with harmonious oscillations By Wayne Hu and Martin White.M
In the beginning, there was light. Under the intense conditions of the early universe, ionized matter gave off radiation that was trapped within it like light in a dense fog. But as the universe expanded and cooled, electrons and protons came together to form neutral atoms, and matter lost its ability to ensnare light. Today, some 14 billion years later, the photons from that great release of radiation form the cosmic microwave background (CMB). Tune a television set between channels, and about 1 percent of the static you see on the screen is from the CMB. When astronomers scan the sky for these microwaves, they find that the signal looks almost identical in every direction. The ubiquity and constancy of the CMB is a sign that it comes from a simpler past, long before structures such as planets, stars and galaxies formed. Because of this simplicity, we can predict the properties of the CMB to exquisite accuracy. And in the past few years, cosmologists have been able to compare these predictions with increasingly precise observations from microwave telescopes carried by balloons and spacecraft. This research has brought us closer to answering some age-old questions: What is the universe made of? How old is it? And where did objects in the universe, including our planetary home, come from?...continued at Scientific American Digital

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