| Piú viste - The Universe Inside |
PIA09956.jpgCosmic "Merger"57 visiteThis artist's concept shows what the night sky might look like from a hypothetical planet around a star tossed out of an ongoing four-way collision between big galaxies (yellow blobs). NASA's SST spotted this "quadruple merger" of galaxies within a larger cluster of galaxies located nearly 5 BLY away.
Though the galaxies appear intact, gravitational disturbances have caused them to stretch and twist, flinging billions of stars into space -- nearly three times as many stars as are in our Milky Way galaxy. The tossed stars are visible in the large plume emanating from the central, largest galaxy. If any of these stars have planets, their night skies would be filled with the monstrous merger, along with other galaxies in the cluster (smaller, bluish blobs).
This cosmic smash-up is the largest known merger between galaxies of a similar size. While three of the galaxies are about the size of our Milky Way galaxy, the fourth (center of image) is three times as big.
All four of the galaxies, as well as most other galaxies in the huge cluster, are blob-shaped ellipticals instead of spirals like the Milky Way.
Ultimately, in about one hundred million years or so, the four galaxies will unite into one. About half of the stars kicked out during the merger will fall back and join the new galaxy, making it one of the biggest galaxies in the universe.MareKromium
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Big_Dipper-1.jpgThe "Big Dipper"...again!57 visiteCaption NASA:"Why would the dome of a telescopic observatory appear translucent red? As one of the telescopes of the Etscorn Observatory of New Mexico Tech waited to inspect small portions of the night sky, playful observers decided to make this unusual image. Tricks needed to create this seemingly impossible shot included opening the observatory dome slightly, using a red light to illuminate the inside of the dome, spinning the dome, and using a long exposure. The open slit in the dome then allowed the camera to incrementally image the inside of the observatory, including the telescope. A fortuitous break in the clouds allowed the stars of the Big Dipper asterism to shine through". MareKromium
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TheMoon_Mars.jpgCompanions57 visitenessun commentoMareKromium
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Sunset.jpgCrescent Moon and Mercury at Sunset57 visite"...Is anything too wonderful for the Lord?..."
Genesis - 18:14MareKromium
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The_Milky_Way-CN.jpgInfinite Reflections...57 visitenessun commentoMareKromium
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Moonrise.JPGMoonrise over Lick Observatory57 visitenessun commentoMareKromium
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Outpost2.JPGThe Outpost N. 2 (by Roberto Tremolada)57 visitenessun commentoMareKromium
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Outpost1.JPGThe Outpost N. 1 (by Roberto Tremolada)57 visitenessun commentoMareKromium
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The_Messengers.jpgThe Messengers (by Roberto Tremolada)57 visitenessun commentoMareKromium
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Walhalla-070912_8930-39.jpgWalhalla57 visitenessun commentoMareKromium
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OldAgeAstronomy.jpgMedieval Astronomy from the "Melk Abbey"57 visiteDa "NASA - Picture of the Day" del giorno 17 Aprile 2009:"Discovered by accident, this manuscript page provides graphical insight to astronomy in medieval times, before the Renaissance and the influence of Nicolaus Copernicus, Tycho de Brahe, Johannes Kepler, and Galileo.
The intriguing page is from the lecture notes on astronomy compiled by the monk Magister Wolfgang de Styria before the year 1490 at Melk Abbey in Austria.
The top panels clearly illustrate the necessary geometry for a lunar (left) and solar eclipse in the Earth-centered Ptolemaic system.
At lower left is a diagram of the Ptolemaic view of the solar system and at the lower right is a chart to calculate the date of Easter Sunday in the Julian calendar.
Text at the upper right explains the movement of the planets according to the Ptolemaic system.
The actual manuscript page is on view at historic Melk Abbey as part of a special exhibition during the International Year of Astronomy".MareKromium
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LongAgo.gifAccording to Lagrange...57 visitenessun commentoMareKromium
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