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    Rosette Nebula (NGC 2237). (Image: Adam Block & Tim Puckett) The red color is hydrogen gas energized by a hot star - it's an emission nebula. The “stem” is formed by a trail of the same glowing hydrogen gas. The nebula is 5000 light years away in the constellation Monoceros.Mona Evans "Monoceros the Unicorn" www.bellaonline.c...

    Rosette Nebula

    NGC 6888: The Crescent Nebula

    Gas, Dust & Stars

    The Horsehead Nebula 1500 light years away, it is a dark cloud that is visible only because of the lighter nebula behind it.

    Rosette Nebula

    Star Formation in the Tarantula Nebula

    Lagoon Nebula NASA/JPL (La Nebulosa Laguna, anche nota come M 8, o NGC 6523, è una nebulosa diffusa visibile nella costellazione del Sagittario. Si tratta di una delle regioni H II più brillanti della volta celeste. La nebulosa contiene anche una struttura nota come "Nebulosa Clessidra", che però non è da confondere con la omonima nebulosa planetaria, nella costellazione della Mosca.)

    5,000 light-years away... lies a Trifid #Nebula which looks somewhat like a heart.

    This photo from NASA's Hubble Space Telescope shows an ominous pillar of gas and dust known as the Cone Nebula. The image shows the top portion of the nebula that is 2.5 light years in height. The Cone Nebula is 2,500 light-years from Earth in the Monoceros constellation. The red halo of light seen around the pillar is caused when ultraviolet radiation causes hydrogen gas in the nebula to glow.

    Rosette Nebula

    Emission nebula IC 1795 / NGC 896 in the constellation Cassiopeia

    The Rosette Nebula

    In the Center of the Trifid Nebula (a star forming region toward the constellation of the Archer. In the center, the three prominent dust lanes that give the Trifid its name all come together. A single massive star near the center causes much of the glow).

    Field of Rosette

    Planetary nebulae can look simple, round, and planet-like in small telescopes. But images from the orbiting Hubble Space Telescope have become well known for showing these fluorescent gas shrouds of dying Sun-like stars to possess a staggering variety of detailed symmetries and shapes.

    The Ring Nebula (M57). The central ring of the Ring Nebula is about one light-year across and 2,000 light-years away. This image was taken by the Hubble Space Telescope. Credit: NASA.

    the rosette nebula

    Great Orion Nebulae - "...also known as M42..."

    NGC 7635: The Bubble Nebula

    The Medusa Nebula -- "Braided, serpentine filaments of glowing gas suggest this nebula's popular name, The Medusa Nebula. Also known as Abell 21, this Medusa is an old planetary nebula some 1,500 light-years away in the constellation Gemini. Like its mythological namesake, the nebula is associated with a dramatic transformation. The planetary nebula phase represents a final stage... as they transform themselves from red giants to hot white dwarf stars..."