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Orion Nebula
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The Orion Nebula is a diffuse nebula situated in the Milky Way, being south of Orion's Belt in the constellation of Orion,[b] and is known as the middle "star" in the "sword" of Orion. It is one of the brightest nebulae and is visible to the naked eye in the night sky with apparent magnitude 4.0. It is 1,344 ± 20 light-years (412.1 ± 6.1 pc) away and is the closest region of massive star formation to Earth. The M42 nebula is estimated to be 24 light-years across. It has a mass of about 2,000 times that of the Sun. Older texts frequently refer to the Orion Nebula as the Great Nebula in Orion or the Great Orion Nebula.
The entire Orion Nebula in a composite image of visible light and infrared; taken by Hubble Space Telescope in 2006
The entire Orion Nebula in a composite image of visible light and infrared; taken by Hubble Space Telescope in 2006
The constellation of Orion with the Orion Nebula (lower middle)
The constellation of Orion with the Orion Nebula (lower middle)
Messier's drawing of the Orion Nebula in his 1771 memoir, Mémoires de l'Académie Royale
Messier's drawing of the Orion Nebula in his 1771 memoir, Mémoires de l'Académie Royale
Henry Draper's 1880 photograph of the Orion Nebula, the first ever taken.
Henry Draper's 1880 photograph of the Orion Nebula, the first ever taken.
Stellar kinematics
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In astronomy, stellar kinematics is the observational study or measurement of the kinematics or motions of stars through space.
Relation between proper motion and velocity components of an object. At emission, the object was at distance d from the Sun, and moved at angular rate
Relation between proper motion and velocity components of an object. At emission, the object was at distance d from the Sun, and moved at angular rate μ radian/s, that is, μ = vt / d with vt = the component of velocity transverse to line of sight from the Sun. (The diagram illustrates an angle μ swept out in unit time at tangential velocity vt.)
Four runaway stars moving through regions of dense interstellar gas and creating bright bow waves and trailing tails of glowing gas. The stars in thes
Four runaway stars moving through regions of dense interstellar gas and creating bright bow waves and trailing tails of glowing gas. The stars in these NASA Hubble Space Telescope images are among 14 young runaway stars spotted by the Advanced Camera for Surveys between October 2005 and July 2006.
Positions and trajectories of 20 high-velocity stars as reconstructed from data acquired by Gaia, overlaid on top of an artistic view of the Milky Way
Positions and trajectories of 20 high-velocity stars as reconstructed from data acquired by Gaia, overlaid on top of an artistic view of the Milky Way
Runaway star speeding from 30 Doradus. Image taken by the Hubble Space Telescope.
Runaway star speeding from 30 Doradus. Image taken by the Hubble Space Telescope.