Explanation: Dust makes this cosmic eye look red. The eerie Spitzer Space Telescope image shows infrared radiation from the well-studied Helix Nebula (NGC 7293) a mere 700 light-years away in the constellation Aquarius. The two light-year diameter shroud of dust and gas around a central white dwarf has long been considered an excellent example of a planetary nebula, representing the final stages in the evolution of a sun-like star. But the Spitzer data show the nebula's central star itself is immersed in a surprisingly bright infrared glow. Models suggest the glow is produced by a dust debris disk. Even though the nebular material was ejected from the star many thousands of years ago, the close-in dust could be generated by collisions in a reservoir of objects analogous to our own solar system's Kuiper Belt or cometary Oort cloud. Formed in the distant planetary system, the comet-like bodies have otherwise survived even the dramatic late stages of the star's evolution.
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Publikacii s klyuchevymi slovami:
planetary nebula - dust - comet - planetary system - Planetarnaya tumannost' - Tumannost' Ulitka - infrakrasnoe izluchenie
Publikacii so slovami: planetary nebula - dust - comet - planetary system - Planetarnaya tumannost' - Tumannost' Ulitka - infrakrasnoe izluchenie | |
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