Orion Nebula

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Orion Nebula,

bright diffuse nebulanebula
[Lat.,=mist], in astronomy, observed manifestation of a collection of highly rarefied gas and dust in interstellar space. Prior to the 1960s this term was also applied to bodies later discovered to be galaxies, e.g.
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 in the constellation Orion; also known as the Great Nebula of Orion and cataloged as M42 or NGC 1976. It is located near the middle of the "sword" hanging from Orion's "belt" of stars. Its central bright region is about 1° in diameter and it has a total extension of 3°. It is about 1,000 light-years distant and as many as 60 light-years in diameter. The nebula is an enormous cloud of gas surrounding a cluster of very hot young stars. To the naked eye the nebula appears to be a faint star but becomes a vague patch of light when viewed through binoculars. The bright region is divided into two sections, the northeast portion being cataloged separately as M43 or NGC 1982. The Orion Nebula is the nearest major site to earth of massive star formation.

Orion nebula

(M42; NGC 1976) One of the brightest emission nebulae in the sky, about 400 parsecs distant. It is just visible to the naked eye as a diffuse luminous patch, 1° across, in the center of Orion's Sword; M43 (NGC 1982) is a small northern part of M42, a dust lane separating them. The Orion nebula is a complex region of ionized hydrogen (an H II region) that is associated with the Orion molecular cloud (OMC-1), part of a system of giant molecular clouds in the Orion constellation. The Orion nebula is centered on a very dense stellar cluster – the Trapezium cluster – containing four hot young stars that excite and ionize the nebula, so producing both radio and optical radiation. Their total luminosity is about 3 × 105 times that of the Sun. The nebula is also a source of X-rays. The region is one of active star formation, containing T Tauri stars, maser sources, Herbig–Haro objects, the BN object, and the Kleinmann-Low nebula. The interface between the nebula and the adjacent molecular cloud is an example of a photodissociation region.

Orion Nebula


a very large gas-dust cloud, the closest nebula to our solar system.

Located about 300 parsecs from our solar system, the Orion nebula is visible in the constellation Orion on moonless winter nights as a pale, twinkling spot. It measures about 5.5 parsecs in diameter. At its center is a small cluster of stars, among which is the Trapezium, which comprises four physically linked, hot, bright stars. Ultraviolet light from these stars causes the gas in the nebula—consisting primarily of hydrogen—to glow. The dust in the Orion Nebula absorbs light, which is partially responsible for the nebula’s wispy appearance.

Orion Nebula

[ə′rī·ən ′neb·yə·lə]
A luminous cloud surrounding Ori, the northern star in Orion's dagger; visible to the naked eye as a hazy object. Also known as Great Nebula of Orion.
References in periodicals archive ?
The Orion Nebula (Messier 42) and, to its immediate north, Messier 43 (sometimes called De Mairan's Nebula) are must-see showpieces in any telescope.
The Orion Nebula is a region of the universe known to be the ideal place for the birth of new stars.
THE STARS: The Orion Nebula, hidden within Orion's sword, makes for one of the sky's most arresting deep-space objects visible to the naked eye.
Summary: This visualisation is an excerpt from a longer sequence that explores the Orion Nebula, using both visible and infrared light
STARGAZERS who don't know their Orion Nebula from their Great Bear now have the chance to find out more about the sky at night.
TEHRAN (FNA)- Using new observations from ESO's VLT Survey Telescope, astronomers have discovered three different populations of baby stars within the Orion Nebula Cluster.
Caption: The Orion Nebula as imaged by the Spitzer Space Telescope.
About 1500 light years away from the Earth, the Orion Nebula is also several hundred light years across.
Capturing the Orion Nebula was another challenge that took lots of work and preparation by Omar.
Every winter, for example, amateurs find themselves gazing at the Great Orion Nebula (Messier 42) on cold, clear nights almost as a matter of ritual.
Jan 21-Feb 19 AQUARIUS I WENT to an astrology shop last week and bought the Orion Nebula, but it burned through the bottom of the bag.
Researchers studied two clusters where Sun-like stars currently are forming-NGC 2024, located in the center of the Flame Nebula, and the Orion Nebula Cluster.