| Piú votate - Deep Sky Objects |
Eta_Carinae-HST.jpgEta Carinae75 visite"...Persa la rotta, speriamo nel Viaggio..."
Gianluigi BarcaMareKromium
(8 voti)
|
|
PIA10206.jpgCassiopeia A71 visite"Bis auf wenige Ausnahmen arbeiten alle Lebewesen auf der Welt, Menschen wie Tiere, mit aller Kraft und Mühe von früh bis spät, nur um zu überleben. Und das Überleben lohnt sich absolut nicht; schließlich stirbt jeder irgendwann.
Es ist ein Geschäft, das die Kosten nicht deckt."
(Traduzione)
"...A parte poche eccezioni, al mondo tutti, uomini e animali, lavorano con tutte le forze, con ogni sforzo, dal mattino alla sera, solo per continuare ad esistere: e non vale assolutamente la pena di continuare ad esistere; inoltre dopo un certo tempo tutti finiscono.
è un affare che non copre le spese..."
Arthur Schopenhauer MareKromium
(8 voti)
|
|
PIA10724.jpgCauldron of Light72 visite"Liebe ist der Zustand, in dem der Mensch die Dinge anders sieht, als sie sind."
(Traduzione)
"...L'amore è lo stato in cui l'uomo vede le cose diverse da come sono..."
F. NietzcheMareKromium
(8 voti)
|
|
Cygnus_Region.jpgCygnus Region75 visite"...La conversazione è feconda soltanto fra spiriti dediti a consolidare le loro perplessità..."
Emile Michel CioranMareKromium
(8 voti)
|
|
NGC-2070.jpgNGC 2070 - Star Forming Region93 visite"...Nei momenti critici una sigaretta porta più sollievo che i Vangeli..."
Emile Michel CioranMareKromium
(8 voti)
|
|
NGC-3372-B.jpgNGC 3372 - The Dark Clouds of the Carina Nebula74 visite"...Quoties inter homines fui, minor homo redii..."
(Seneca)
"...Ogni volta che fui in mezzo agli uomini, mi ritrovai diminuito (come uomo)..." (ovvero: più si sta in mezzo ai tumulti del - cosiddetto - "vivere civile", e peggio si diventa)MareKromium
(8 voti)
|
|
HD-189733b-PIA10364.jpgHD-189733b - Exoplanet in Vulpecula75 visite"...Vulpes non capitur muneribus..."
(Proverbio Medioevale)
"...L'astuzia non si lascia vincere (non la si può corrompere) dai (con) regali..." (trad. libera)MareKromium
(8 voti)
|
|
NGC-3576.jpgNGC 3576 - Star Forming Region75 visite"...The Earth is the Lord's and all that is in it,
The World, and those who live in it;
For He has founded it on the Seas,
And established it on the Rivers..."
- Psalm 24:1-2MareKromium
(8 voti)
|
|
HD-189733b-1.jpgExtra-Solar Planet HD 189733b75 visiteNASA's Hubble Space Telescope (HST) has made the first detection ever of an organic molecule in the atmosphere of a Jupiter-sized planet orbiting another star. This breakthrough is an important step in eventually identifying signs of life on a planet outside our Solar System.
The molecule found by Hubble is Methane, which under the right circumstances can play a key role in prebiotic chemistry the chemical reactions considered necessary to form life as we know it.
This discovery proves that Hubble and upcoming space missions, such as NASA's James Webb Space Telescope, can detect organic molecules on planets around other stars by using spectroscopy, which splits light into its components to reveal the "fingerprints" of various chemicals.
"This is a crucial stepping stone to eventually characterizing prebiotic molecules on planets where life could exist," said Mark Swain of NASA's Jet Propulsion Laboratory (JPL), Pasadena, Calif., who led the team that made the discovery. Swain is lead author of a paper appearing in the March 20 (2008) issue of Nature.
The discovery comes after extensive observations made in May 2007 with Hubble's Near Infrared Camera and Multi-Object Spectrometer (NICMOS). It also confirms the existence of water molecules in the planet's atmosphere, a discovery made originally by NASA's Spitzer Space Telescope in 2007. "With this observation there is no question whether there is water or not water is present", said Swain.
The planet now known to have Methane and water is located 63 Light-Years away in the constellation Vulpecula. Called HD 189733b, the planet is so massive and so hot it is considered an unlikely host for life. HD 189733b, dubbed a "hot Jupiter", is so close to its parent star it takes just over two days to complete an orbit. These objects are the size of Jupiter but orbit closer to their stars than the tiny innermost planet Mercury in our solar system.
HD 189733b's atmosphere swelters at 1700 degrees Fahrenheit, about the same temperature as the melting point of Silver.
Though the star-hugger planet is too hot for life as we know it, "this observation is proof that spectroscopy can eventually be done on a cooler and potentially habitable Earth-sized planet orbiting a dimmer red dwarftype star," Swain said. The ultimate goal of studies like these is to identify prebiotic molecules in the atmospheres of planets in the "habitable zones" around other stars, where temperatures are right for water to remain liquid rather than freeze or evaporate away.
The observations were made as the planet HD 189733b passed in front of its parent star in what astronomers call a transit. As the light from the star passed briefly through the atmosphere along the edge of the planet, the gases in the atmosphere imprinted their unique signatures on the starlight from the star HD 189733.
The astronomers were surprised to find that the planet has more Methane than predicted by conventional models for "hot Jupiters".
"This indicates we don't really understand exoplanet atmospheres yet," said Swain. "These measurements are an important step to our ultimate goal of determining the conditions, such as temperature, pressure, winds, clouds, etc., and the chemistry on planets where life could exist. Infrared spectroscopy is really the key to these studies because it is best matched to detecting molecules", said Swain.
Swain's co-authors on the paper include Gautam Vasisht of JPL and Giovanna Tinetti of University College, London/European Space Agency.MareKromium
(8 voti)
|
|
NGC-1132.jpgElliptical Galaxy NGC 113275 visite"...A che cosa o a chi pu servire una Verit che non sia Patrimonio di tutti?!?..."
Paolo C. Fienga - "Pensieri su Scienza & Dintorni"
MareKromium
(8 voti)
|
|
RSPup_Kervella.jpgEchoes from RS Puppis73 visite"...Se vuoi davvero sorprendermi mostrandomi qualcosa, allora mostrami il Nulla..."
P.C. Floegers - "Conversations for Tomorrow"MareKromium
(8 voti)
|
|
Abell-901_and_902.jpgAbell 901 and 902 (HST)116 visite"...My mouth shall speak Wisdom; the meditation of my heart shall be understanding..."
- Psalm 49:3MareKromium
(8 voti)
|
|
| 1039 immagini su 87 pagina(e) |
 |
|
|
|
|
56 | |
|
|
|
|
