| Piú votate - The Universe Inside |
Solar_Eclipse~1.jpgEclipse over the Temple of Poseidon84 visitenessun commentoMareKromium
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Earth.pngMother Earth86 visiteDalla Rubrica "NASA - Picture of the Day", del giorno 23 Novembre 2009:"Goodbye Earth!
Earlier this month, ESA's interplanetary Rosetta Spacecraft zoomed past the Earth on its way back across the Solar System.
Pictured above, Earth showed a bright crescent phase featuring the South Pole to the passing rocket ship. Launched from Earth in 2004, Rosetta used the gravity of the Earth to help propel it out past Mars and toward a 2014 rendezvous with Comet Churyumov-Gerasimenko.
Last year, the Robot Spacecraft passed asteroid 2867 Steins, and next year it is scheduled to pass enigmatic asteroid 21 Lutetia. If all goes well, Rosetta will release a probe that will land on the 15-Km diameter comet in 2014". MareKromium
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ToTheHumanMind.gifA Tribute To The Human Mind (by Marco Faccin)94 visiteBellissimo. Ed incommentabile...MareKromium
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EyesInTheSky.jpgEyes in the Sky86 visitenessun commentoMareKromium
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TheGreyIllusion.JPGThe "Same Color Illusion"75 visiteDa "NASA - Picture of the Day" del giorno 4 Ottobre 2009:"Are square A and B of the same color?
They are.
The above illusion, called the "Same Color Illusion", illustrates that purely human observations in science may be ambiguous or inaccurate. Even such a seemingly direct perception as relative color. Similar illusions exist on the sky, such as the size of the Moon near the Horizon, or the apparent shapes of astronomical objects. The advent of automated, reproducible, measuring devices such as CCDs have made science in general and astronomy in particular less prone to, but not free of, human-biased illusions".MareKromium
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Triple_Sunrise.jpgTriple Sunrise74 visiteDa "NASA - Picture of the Day" del giorno 4 Agosto 2009:"How can the same Sun rise three times? Last month on Friday, 2009 July 10, a spectacular triple sunrise was photographed at about 4:30 am over Gdansk Bay in Gdansk, Poland. Clearly, our Sun rises only once. Some optical effect is creating at least two mirages of the Sun -- but which effect? In the vast majority of similarly reported cases, mirages of the brightest object in the frame can be traced to reflections internal to the camera taking the images. Still, the above image is intriguing because a sincere photographer claims the effect was visible to the unaided eye, and because the photographer took several other frames that show variants of the same effect. Therefore, polite readers are invited to debate whether the above image captures a particularly spectacular example of common reflections inside a standard digital camera, shows one of the most spectacular examples of atmospheric lensing yet recorded, or was caused by something completely different. If the discussion converges, the consensus will be posted here at a later date".MareKromium
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Saturn_and_Dione.jpgConjunction (by Roberto Tremolada)71 visitenessun commentoMareKromium
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The_Sun~0.jpgPurple Sun (by Marco Faccin)80 visitenessun commentoMareKromium
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MeteorMilkyway_rowell.jpgTemporary Sky83 visitenessun commentoMareKromium
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Minds-MF.jpgA Beautiful Mind (by Marco Faccin)81 visitenessun commentoMareKromium
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Walhalla-070912_8930-39.jpgWalhalla85 visitenessun commentoMareKromium
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WarmPlanetColdStar-PIA11980.jpgWarm Planet, Cold Star83 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.MareKromium
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