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Scientists were able to see the appearance of a comet

26 Oct

cometThe distant star systems at the time of their inception. The study of protoplanetary disks at different stages of evolution has confirmed speculation about our own past. In one system, the scientists saw steam and “ocean” of ice crystals, precursors of comets and the other spotted comet bombardment that goes right now. Unsweetened have a hypothetical planets, the star That Raven (Eta Corvi), located less than 60 light-years from the Sun. Spitzer telescope registered a powerful drive there from dust located in the habitable zone. The very dust containing water, carbon compounds, rocky material, especially its composition and temperature – all indicate that there is a process that is identical to the late heavy bombardment in our own solar system.
And is this comet and asteroid attack the planets about the same age of the system, in which she came with us. Indicate the similarities and the spectral “fingerprints”, reminiscent of a sensational meteor Almahata Sitta, indicating that the proximity in terms of origin of the bodies were destroyed during the collision in the Eta Crow and ours. In addition, about 150 astronomical units from the Eta Raven is located in a ring of cold dust that is suitable receptacle for the army of comets similar to our own Kuiper Belt. Once the migration of gas giants caused the instability of myriads of icy bodies in the solar system, resulting in approximately 300 million years for the inner planets from space hit by blow after blow. Scientists suggest that in the past, it was asteroids and comets brought to the young Earth to life a number of important organic compounds, and also water. On the latter managed to find out new details of the telescope Herschel. The star TW Hydra (TW Hydrae) apparatus revealed a large dust disk (in the future capable of becoming a planet), which contains a huge amount of water. This is not the first water, identified in the emerging planetary systems, but for the first time she found at a respectable distance from the star, in a region where the comet should be formed. Found the water can fill thousands of Earth’s oceans, and thus containing water rocky worlds like our own home, may be much more widespread in the cosmos.
TW Hydra – the star is very young, she’s only 10 million years old (it is located, by the way, 175 light-years away). So for example, we see her one of the earliest stages of formation of planetary systems. The study’s authors believe that the water in TW Hydra dwells mostly in the form of ice that covers a speck of dust in the protoplanetary disk. But the ice gradually evaporates under this action of the rays parent star, which allows us to capture the signature H2O molecules by means of terrestrial instruments.

 
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Posted by on October 26, 2011 in Galaxy

 

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