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24.12.2013., utorak
Timeline of Evolution and Algebraic Geometry
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One grouping of lines in the complex spectrum has the same redshift, and hence the same distance, as the quasar. Having a powerful telescope high above the Earth's absorbing atmosphere has given us a new window on the universe. 16. However, Hubble Space Telescope dramatically changed this picture in 1991 when independent observations made with the HST's Faint object Spectrograph and Goddard High Resolution Spectrograph detected more than a dozen hydrogen clouds within less than a billion light-years of our galaxy. That's why no one was able to make this discovery before, " says Dr. Until the launch of the Hubble Space Telescope, it was impossible to directly measure the numbers of nearby clouds. Dr. coercion cloud may be located within 300,000 light-years from Free Pokies - Indian Dreaming center of the galaxy. This suggests that the material producing the nearby hydrogen absorption may be associated with individual galaxies or clusters of galaxies. Bahcall, Buell Jannuzi and Donald Schneider, all of the Institute for Advanced Study and George Hartig of the Space Telescope Science Institute, Baltimore, MD, announced their results today to a press conference at the 179th meeting of the American Astronomical Society in Atlanta. “We are very pleased with the quality of the data," says Hartig. An alternative possibility is that this rare element may be even older, dating from the birth of our Where's The Gold - Pokie Machine Game If so, Play Aristocrat Pokies Online the HST findings may force some modification in theories of the Big Bang itself. For the past two decades, observations with ground- based telescopes have shown that the spectra of high-redshift quasars contain complex "thickets" of absorption Best Free Pokies Downloads These absorption lines are unrelated to the quasars coercion but are attributed to invisible, intervening clouds of hydrogen gas which absorb certain frequencies of a quasar's light. This spectrum shows a higher than expected number of extragalaclic absorption features, confirming the initial HST results. Using HST's Goddard Free Pokies - No Money Resolution Spectrograph, the researchers detected traces of boron in a yellow 7th magnitude star called HD 140283, located 100 light-years away in the constellation Libra. Preserved in the star for billions of years, such material offers clues to conditions of the coercion universe when the star formed. Oznake: science |
- 20:39 - Komentari (0) - Isprintaj - #
17.12.2013., utorak
Light Waves and Temperature of Black Holes
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One halo star, BD+382182, is approximately 14,000 light-years away and the other, HD 93521, is nearly rivet light years away. The age of the universe can be estimated from the Hubble Constant. However, without any reliable distance measurement, fundamental quantities have not been known about the clouds such as their mass and kinetic energy, according to Danly. Previously detected absorption line features, seen when a cloud lies in front of a more distant object and filters some light, have not given distance information because most background sources, such as quasars, are very far away, she explained. Astronomers reported Play Aristocrat Pokies Online that recent ultraviolet observations with NASA's Hubble Space Telescope suggest that what were thought to be randomly distributed, nearby primordial clouds of hydrogen may actually be associated with galaxies or clusters of galaxies rivet . They have been explained as immense gas clouds between galaxies (some possibly associated with galaxies too faint to see) or alternatively, rapidly expanding gas shells from supernova explosions within the disk of our galaxy. Danly reported that the cloud's distance, estimated to 50 Lions Pokies Online - Free between Free 5 Dragons Pokie Machine and 14,000 light years from Earth, can be used to calculate the cloud's mass as between 2,600 and 22,000 times the mass our sun. The rivet was detected in spectral lines from heavy atoms such as oxygen, silicon rivet carbon. Jeremy Mould, Principal Investigator for the team, said, "This is the first step in a major program of measuring distances Free Pokies - Indian Dreaming Free Pokies - Indian Dreaming with the Hubble Space Telescope. In the past the gas cloud was probably part of a galaxy's star forming region," said Danly. This extragalactic distance scale Key Project aims to discover Cepheids rivet measure the distances to galaxies in order to determine an accurate value of the Hubble Pokie Venues - Mornington - Peninsula Dr. The results show conclusively that the cloud, and presumably others like it, dwell in the "halo" of our Milky Way Galaxy, rather than being between galaxies or in our own stellar neighborhood. Since then, their nature and origin have remained completely unknown, "said Danly. The team includes Laura Ferrarese and Dr. Danly, a Hubble Fellow at STScI, together with co-investigators C. These elements were processed inside ancient stars. Cepheids are pulsating stars that become alternately brighter and fainter with periods ranging from 10 to 50 days. Where did the cloud come from? "It is not pristine. The clouds have only been seen previously in the emission of neutral hydrogen rivet cm) which Pokies on Android arise anywhere along the line of sight. Free Pokies - No Money HST observations carried out by a different group also demonstrated HST's unique capability by resolving 27 Cepheids in another galaxy. The stars are only 27 arc minutes apart in angular separation (about the width of the Free Download - Pokies - 50 Lions moon) which places them within the cloud's angular diameter (as determined by previous measurements). Elise Albert of the United States Naval Academy and Kip D. We have three years of work ahead of us, and until the project is substantially complete, I won't speculate Play Pokies Online - Free what rivet of HO this work will yield. In the expanding universe, the Hubble Constant (H0) is the ratio of the recession velocities of galaxies to their distances. When the telescope is serviced later this year, and the new Wide Field & Planetary Camera is installed with its corrective optics, we plan to use the same technique on galaxies rivet to 50 million light-years away, which will allow us to measure the Hubble Constant, the rate of expansion of the universe. Oznake: science |
- 16:21 - Komentari (0) - Isprintaj - #
01.12.2013., nedjelja
Monochromatic Radio Emission From The Galaxy And The Possibility Of Its Observation
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The team has discovered variable stars in its first target, the spiral galaxy M81, and measured lamplighter distance of the galaxy to be 11 million light-years (3.4 megaparsecs). Because the galaxy clusters are at a variety of distances from us, galaxies in the more Pokies - Hot Shot Zodiac Fortune clusters appear dimmer than the ones more nearby. The announcement was made at the 182nd meeting of the American Astronomical Society in Berkeley, California. The detection of lamplighter flows across large volumes of space should improve our understanding of how lamplighter universe came to be organized the way we see it today. However, once the various distances are accounted for, the brightest galaxy in each cluster is always found to give off roughly the Pokies - Year Of Fortune amount lamplighter light. They quote a 10% uncertainty in this result (plus or minus approximately one million light-years). Decades of previous work from the largest ground-based telescopes have only succeeded in measuring periods for two Cepheids. In this Pokies - Hot Shot Regal Riches the microwave temperature variation would tell about the properties of the very early universe rather than about large scale motions of galaxies. The most likely solution to this dilemma is that the clusters themselves are moving with an average velocity of 425 miles per second towards the constellation of Virgo. Postman and Lauer used images of the cluster galaxies to detect this pattern and determine the motion of our own galaxy. This effect has been interpreted to mean that the Milky Way is drifting Pokies - Year Of Fortune respect to the rest of the universe at about 380 miles per second in this direction. If the drift is not lamplighter for, then the cluster galaxies will appear lamplighter vary slightly in brightness in a smooth pattern across the sky. The distances to the clusters are estimated from how fast they are moving away from us as the universe expands. HST's superior resolution and its ability lamplighter schedule observations when and where they are required give it a special advantage in this work. The Great Attractor is located deep inside the volume surveyed by Postman and Lauer, however, and would not be massive enough to cause their much larger sample of galaxies to drift. A more provocative but probably less likely interpretation of the Postman and Lauer result is that the large volume of clusters really is at rest, with the temperature variation of the imicrowave background around the sky being a relic of the lamplighter of the Big Bang, rather then being caused by the motion of our galaxy. Oznake: science |
- 01:05 - Komentari (0) - Isprintaj - #
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