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OldAgeAstronomy.jpgMedieval Astronomy from the "Melk Abbey"58 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".MareKromiumApr 17, 2009
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HighwaysToForever090306_6229-32.jpgHighways to Forever78 visitenessun commentoMareKromiumApr 14, 2009
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Walhalla-070912_8930-39.jpgWalhalla58 visitenessun commentoMareKromiumApr 14, 2009
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Venus.jpgDaytime Venus59 visiteDa "NASA - Picture of the Day" del giorno 9 Aprile 2009:"This remarkable picture of a slender crescent Venus was made during daylight hours on March 26, 2009.
Venus was then very near Inferior Conjunction, its closest approach to a point on a line directly between Earth and the Sun. So, daylight was a good time to carefully record the telescopic view when both Venus and Sun were high in the daytime sky.
Near Inferior Conjunction, Venus is closest to us and at its largest apparent size, but Venus is also strongly backlit by Sunlight, presenting its night side partially outlined by a narrow crescent.
What makes the image remarkable are the faint arcs extending beyond the sunlit crescent around to the night side of Venus, due to sunlight filtering through the Planet's dense Atmosphere.
Astronomer Eddie Guscott reports from his site in Essex, England, that the faint extensions came and went as the Earth's atmospheric blurring changed. His image was constructed from 85 of the sharpest frames chosen from thousands taken with a webcam and telescope".MareKromiumApr 09, 2009
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WarmPlanetColdStar-PIA11980.jpgWarm Planet, Cold Star63 visiteThis artist's conception shows a young, hypothetical planet around a cool star. A soupy mix of potentially life-forming chemicals can be seen pooling around the base of the jagged rocks. Observations from NASA's Spitzer Space Telescope hint that planets around cool stars — the so-called M-dwarfs and Brown dwarfs that are widespread throughout our Galaxy — might possess a different mix of life-forming, or prebiotic, chemicals than our young Earth.
Life on our Planet is thought to have arisen out of a pond-scum-like mix of chemicals. Some of these chemicals are thought to have come from a planet-forming disk of gas and dust that swirled around our young Sun. Meteorites carrying the chemicals might have crash-landed on Earth.
Astronomers don't know if these same life-generating processes are taking place around stars that are cooler than our Sun, but the Spitzer observations show their disk chemistry is different. Spitzer detected a prebiotic molecule, called Hydrogen Cyanide (Cianuro di Idrogeno), in the disks around yellow stars like our Sun, but found none around cooler, less massive, reddish stars. Hydrogen Cyanide is a carbon-containing, or organic compound. Five Hydrogen Cyanide molecules can join up to make Adenine — a chemical element of the DNA molecule found in all living organisms on Earth.MareKromiumApr 08, 2009
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Proximity.jpgProximity (by Roberto Tremolada)61 visitenessun commentoMareKromiumApr 05, 2009
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The_Messengers.jpgThe Messengers (by Roberto Tremolada)59 visitenessun commentoMareKromiumApr 05, 2009
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ShatterDay.jpgShatterday (by Roberto Tremolada)61 visitenessun commentoMareKromiumApr 05, 2009
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Almahata-Sitta15_2048.jpgAlmahata Sitta 1581 visiteDa "NASA - Picture of the Day", del giorno 28 Marzo 2009:"Small Asteroid 2008 TC3 fell to Earth at dawn on October 7, 2008, tracking through the skies over the Nubian Desert in Northern Sudan. That event was remarkable because it was the first time an asteroid was detected in space before crashing into planet Earth's Atmosphere.
It was generally assumed the asteroid itself had completely disintegrated to dust. But, based on satellite and ground observations of the atmospheric impact event, Dr. Mauwia Shaddad of the University of Khartoum, aided by Dr. Peter Jenniskens of the SETI Institute and NASA Ames Research Center, led an expedition of students and staff to the area, combing the desert for surviving fragments.
On December 6, 2008, 2 hours after their search began, the first meteorite was found. The team ultimately collected some 280 small meteorites, now called Almahata Sitta, with a total mass of about 5 kilograms -- the first material recovered from a known asteroid. In stark contrast to the lighter-colored stones, the black fragment in the picture is Almahata Sitta meteorite number 15. About 4 centimeters in diameter, it is seen as it came to rest on the desert floor".
Nota Lunexit: la fotografia, sebbene suggestiva, presenta - a nostro parere - delle notevoli incongruenze di texture e colore. In altre parole, sembra più un image-composite che un vero e proprio single still.
Abbiamo quindi leggermente modificato la colorizzazione del frame, adattando il suolo al colore tipico della superficie del Deserto Sudanese (la "fotografia" originale sembra essere parecchio sovrasaturata) ed il colore blu del cielo è stato leggermente abbassato di tonalità ed intensificato (così ricreando - in visione - le condizioni atmosferiche tipiche dei cieli che sovrastano regioni desertiche in cui l'Atmosfera è estremamente secca e l'Opacità - Atmosferica - bassissima o nulla).MareKromiumMar 28, 2009
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BeforeTheMigration-00.jpgMars before the Great Migration (by Roberto Tremolada)61 visitenessun commentoMareKromiumMar 24, 2009
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BeforeTheMigration-01.jpgMars before the Great Migration (by Roberto Tremolada)61 visitenessun commentoMareKromiumMar 24, 2009
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BeforeTheMigration-02.jpgMars before the Great Migration (by Roberto Tremolada)128 visitenessun commentoMareKromiumMar 24, 2009
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