Stoftnebulosor
Hästhuvudnebulosan (Barnard 33)
Stoftnebulosorna är nebulosor som består av rymdstoft, som antingen reflekterar eller absorberar ljus ifrån ofta intilliggande stjärnor. Stoftnebulosor som reflekterar ljus går under benämningen reflektionsnebulosor och sådana som absorberar ljus benämns vanligen mörka nebulosor.
Delar av rymden rymmer stora ofta osymetriska moln av materia. När sådana moln skymmer stjärnornas ljus, skapas mörka områden vilka kallas mörka nebulosor. Reflektionsnebulosorna ligger ofta intill de mörka nebulosorna. För dessa gäller istället att den utstrålande stjärnan ligger framför stoftmolnet, vilket då istället reflekterar stjärnans eller stjärnornas ljus. En av de mest kända mörka nebulosorna är Hästhuvudnebulosan i Orions stjärnbild.
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Horsehead-Hubble.jpg
Rising from a sea of dust and gas like a giant seahorse, the Horsehead nebula is one of the most photographed objects in the sky. NASA/ESA Hubble Space Telescope took a close-up look at this heavenly icon, revealing the cloud's intricate structure. The Horsehead, also known as Barnard 33, is a cold, dark cloud of gas and dust, silhouetted against the bright nebula, IC 434. The bright area at the top left edge is a young star still embedded in its nursery of gas and dust. But radiation from this hot star is eroding the stellar nursery. The top of the nebula also is being sculpted by radiation from a massive star located out of Hubble's field of view.
Rising from a sea of dust and gas like a giant seahorse, the Horsehead nebula is one of the most photographed objects in the sky. NASA/ESA Hubble Space Telescope took a close-up look at this heavenly icon, revealing the cloud's intricate structure. The Horsehead, also known as Barnard 33, is a cold, dark cloud of gas and dust, silhouetted against the bright nebula, IC 434. The bright area at the top left edge is a young star still embedded in its nursery of gas and dust. But radiation from this hot star is eroding the stellar nursery. The top of the nebula also is being sculpted by radiation from a massive star located out of Hubble's field of view.