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NASA Telescope Helps Confirm Nature of Dark Energy

By Guest PostMay 20, 2011Science3 d map, albert einstein, anglo australian telescope, australia, big bang, caltech, chris blake, christopher martin, constant force, cosmic time, dark energy, dark matter, galaxies, galaxy evolution explorer, gravitational attractions, gravity, how dark energy works, jon morse, melbourne, NASA, siding spring mountain, swinburne university of technology, universe

PASADENA, Calif. — A five-year survey of 200,000 galaxies, stretching back seven billion years in cosmic time, has led to one of the best independent confirmations that dark energy is driving our universe apart at accelerating speeds. The survey used data from NASA’s space-based Galaxy Evolution Explorer and the Anglo-Australian Telescope on Siding Spring Mountain in Australia.

The findings offer new support for the favored theory of how dark energy works — as a constant force, uniformly affecting the universe and propelling its runaway expansion. They contradict an alternate theory, where gravity, not dark energy, is the force pushing space apart. According to this alternate theory, with which the new survey results are not consistent, Albert Einstein’s concept of gravity is wrong, and gravity becomes repulsive instead of attractive when acting at great distances. (more…)

Measuring the Distant Universe in 3-D

By Guest PostMay 7, 2011Science3 d map, absorption, anže slosar, apache point observatory, bao, baryon acoustic oscillation, baryon oscillation, baryon oscillation spectroscopic survey, berkeley lab, bill carithers, BOSS, centers of galaxies, dark energy, david schlegel, james rich, lyman alpha forest, map intergalactic hydrogen gas, new mexico, of light years, precision tool, quasars, red galaxies, redshift, sdss, sloan digital sky survey, sloan telescope, spectrum, supermassive black holes, universe, wiggly structure

*Berkeley Lab-led BOSS proves it can do the job with quasars*

The biggest 3-D map of the distant universe ever made, using light from 14,000 quasars — supermassive black holes at the centers of galaxies many billions of light years away — has been constructed by scientists with the third Sloan Digital Sky Survey (SDSS-III).

The map is the first major result from the Baryon Oscillation Spectroscopic Survey (BOSS), SDSS-III’s largest survey, whose principal investigator is David Schlegel of the U.S. Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab). The huge new map was presented at the April meeting of the American Physical Society in Anaheim, CA, by Anže Slosar of Brookhaven National Laboratory. (more…)

Cassini Spots Potential Ice Volcano on Saturn Moon

By Guest PostDecember 15, 20101 commentScience3 d map, cassini, cassini huygens mission, cassini radar images, cassini spacecraft, cryovolcanoes, earth, enceladus, erupts, flagstaff, ice, ice volcanoes, Iceland, italy, jeffrey kargel, laki, molten rock, moon, mt etna, NASA, randolph kirk, saturn, solar system, sotra facula, subterranean geological activity, titan, topography, volcanic topography

PASADENA, Calif. — NASA’s Cassini spacecraft has found possible ice volcanoes on Saturn’s moon Titan that are similar in shape to those on Earth that spew molten rock.

Topography and surface composition data have enabled scientists to make the best case yet in the outer solar system for an Earth-like volcano landform that erupts in ice. The results were presented on December 14 at the American Geophysical Union meeting in San Francisco. (more…)

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NASA Telescope Helps Confirm Nature of Dark Energy

Measuring the Distant Universe in 3-D

Cassini Spots Potential Ice Volcano on Saturn Moon