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Articles in 'Astronomy' (Page 194)
Magnetic field uses sound waves to ignite sun's ring of fire
— 31 May 2007 07:18Sound waves escaping the Sun's interior create fountains of hot gas that shape and power the chromosphere, a thin region of the suns atmosphere which appears as a ruby red ring of fire around the moon during a total solar eclipse, according to research funded by NASA and the National Science Foundation (NSF). These results were presented at the American Astronomical Society Meeting in Honolulu, Hawaii…
Hubble photographs grand spiral galaxy M81
— 30 May 2007 12:43The sharpest image ever taken of the large grand design spiral galaxy M81 is being released at the American Astronomical Society Meeting in Honolulu, Hawaii. A spiral-shaped system of stars, dust, and gas clouds, the galaxy arms wind all the way down into the nucleus. Though the galaxy is located 11.6 million light-years away, the Hubble Space Telescope view is so sharp that it can resolve individual stars, along with open star clusters, globular star clusters, and even glowing regions of fluorescent gas. The Hubble data was taken with the Advanced Camera for Surveys in 2004 through 2006. This colour composite was assembled from images taken in blue, visible, and infrared light…
Many new planets reported
— 29 May 2007 22:10The worlds largest and most prolific team of planet hunters announced the discovery of 28 new planets outside our solar system, increasing to 236 the total number of known exoplanets. University of California, Berkeley, post-doctoral fellow Jason T. Wright and newly minted PhD John Asher Johnson reported the new exoplanets at the semi-annual meeting of the American Astronomical Society (AAS) in Honolulu. The findings are a result of the combined work of the California and Carnegie Planet Search team and the Anglo-Australian Planet Search team…
Collision of titans caught
— 28 May 2007 22:54Using NASAs Far Ultraviolet Spectroscopic Explorer (FUSE) satellite and ground-based telescopes, astronomers have determined, for the first time, the properties of a rare, extremely massive, and young binary star system. The system, known as LH54-425, is located in the Large Magellanic Cloud, a satellite galaxy of our Milky Way. The binary consists of two O-stars, the most massive and luminous types of stars in the Universe…
Spitzer nets thousands of galaxies in a giant cluster
— 28 May 2007 22:54In just a short amount of time, NASA's Spitzer Space Telescope has bagged more than a thousand previously unknown dwarf galaxies in a giant cluster of galaxies. Despite their diminutive sizes, dwarf galaxies play a crucial role in cosmic evolution. Astronomers think they were the first galaxies to form, and they provided the building blocks for larger galaxies. They are by far the most numerous galaxies in our Universe, and are an important tracer of the large-scale structure of the cosmos. Computer simulations of cosmic evolution suggest that high-density regions of the Universe, such as giant clusters, should contain significantly more dwarf galaxies than astronomers have observed to date…
Cosmologists predict a static universe in 3 trillion years
— 24 May 2007 18:09When Dutch astronomer Willem de Sitter proposed a static model of the universe in the early 1900s, he was some 3 trillion years ahead of his time. Now, physicists Lawrence Krauss from Case Western Reserve University and Robert J. Scherrer from Vanderbilt University predict that trillions of years into the future, the information that currently allows us to understand how the universe expands will have disappeared over the visible horizon. What remains will be an island universe made from the Milky Way and its nearby galactic Local Group neighbours in an overwhelmingly dark void…
Cassini CAT scan maps clumps in the rings of Saturn
— 22 May 2007 19:40The largest and most densely packed ring of Saturn is composed of dense clumps of particles separated by nearly empty gaps, according to new findings from NASAs Cassini spacecraft. These clumps in Saturns B ring are neatly organised and constantly colliding, which surprised scientists…
Breathtaking views of Deuteronilus Mensae on Mars
— 21 May 2007 15:10The High Resolution Stereo Camera (HRSC) on board ESAs Mars Express has captured breathtaking images of the Deuteronilus Mensae region on Mars. The images were taken on 14 March 2005 during orbit number 1483 of the Mars Express spacecraft with a ground resolution of approximately 29 metres per pixel…
An inconvenient galaxy
Machinists build precision scientific instruments