| Piú viste - The Universe Inside |
SOL694-2P187972203EFFAKBAP0050L7M1~0.jpgDawn on Mars71 visitenessun commento
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Sunset~1.jpgUntitled (by Brian Cameron)71 visitenessun commentoMareKromium
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PurpleRain.jpgPurple Rain (by Marco Faccin)71 visitenessun commentoMareKromium
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Vision.jpgGalactic Vision71 visitenessun commentoMareKromium
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Dyson_Sphere_-_03.jpgThe Dyson Sphere (here: Complex and interconnected Dyson Swarm)71 visiteDyson-style energy collectors around a distant star would absorb and re-radiate energy from the star. The wavelengths of such re-radiated energy may be atypical for the star's spectral type, due to the presence of heavy elements not naturally occurring within the star.
If the percentage of such atypical wavelengths were to be significant, an alien megastructure could be detected at interstellar distances. This could indicate the presence of what has been called a Type II Kardashev civilization.
SETI has looked for such infrared-heavy spectra from solar analogs, as has Fermilab. Fermilab discovered 17 potential "ambiguous" candidates, of which four were in 2006 called "amusing but still questionable". Later searches also resulted in several candidates, all of which remain unconfirmed.MareKromium
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Dyson_Swarm_-_03.jpgThe Dyson Sphere71 visiteHow It Works: each satellite in the Swarm absorbs or reflects the star’s sunlight and beams it to where it is needed—such as to an inhabited planet or orbital space stations.
Uses: the captured energy could power an entire civilization, propel massive spaceships using photon sails, or run planetary-scale supercomputers and artificial intelligence networks.
Materials: constructing a comprehensive Swarm requires a staggering amount of raw materials. Theorists suggest that disassembling an entire rocky planet, like Mercury, could provide enough mass to build the initial stages of a Swarm.
Gradual Build: our Civilization wouldn't build a full Swarm all at once. We would likely start with a "proto-swarm" consisting of space-based solar arrays, expanding it over thousands of years.MareKromium
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M 31 and Hale Bopp.jpgTemporary Sky...70 visiteDa "NASA - Picture of the Day" del 13 Agosto 2006:"The Moon almost ruined this photograph. During late March and early April 1997, Comet Hale-Bopp passed nearly in front of the Andromeda Galaxy.
Here the Great Comet of 1997 and the Great Galaxy in Andromeda were photographed together on 1997 March 24th. The problem was the brightness of the Moon. The Moon was full that night and so bright that long exposures meant to capture the tails of Hale-Bopp and the disk of M31 would capture instead only moonlight reflected off the Earth's atmosphere. By the time the Moon would set, this opportunity would be gone. That's why this picture was taken during a total lunar eclipse".
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The_Moon_and_Saturn.jpgSo close, and yet, so far...70 visite"...A Verbal Art like Poetry is reflective: it stops to think. Music is immediate: it goes on to become..."
W.H. Auden (1907 - 1973) - "Music and Imagination" (1952)MareKromium
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Saturn_Venus.jpgEvening Friends70 visite"...Sanctum hoc poetae nomen quod nulla umquam barbaria violavit..."
(Cicerone - "Pro Archia")
"...Venerato è il nome di Poeta, poichè nessuna barbarie potè violarlo..."MareKromium
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CloudsandStars.jpgIn the twilights...70 visitenessun commentoMareKromium
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PIA09956.jpgCosmic "Merger"70 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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Phobos_Eclipsing_Victoria.jpgPhobos eclipsing Victoria Crater's Region (elab. Lunexit)70 visitenessun commentoMareKromium
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