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Orion Molecular Cloud Complex
The Orion molecular cloud complex (or, simply, the Orion complex) is a star-forming region with stellar ages ranging up to 12 Myr. Two Molecular cloud#Giant molecular clouds, giant molecular clouds are a part of it, Orion A and Orion B. The stars currently forming within the complex are located within these clouds. A number of other somewhat older stars no longer associated with the molecular gas are also part of the complex, most notably the Orion's Belt (Orion OB1b), as well as the dispersed population north of it (Orion OB1a). Near the head of Orion there is also a population of young stars that is centered on Meissa. The complex is between 1 000 and 1 400 light-years away, and hundreds of light-years across. The Orion complex is one of the most active regions of nearby star formation, stellar formation visible in the night sky, and is home to both protoplanetary discs and very young stars. Much of it is bright in infrared wavelengths due to the heat-intensive process ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
J2000
In astronomy, an epoch or reference epoch is a moment in time used as a reference point for some time-varying astronomical quantity. It is useful for the celestial coordinates or orbital elements of a celestial body, as they are subject to perturbations and vary with time. These time-varying astronomical quantities might include, for example, the mean longitude or mean anomaly of a body, the node of its orbit relative to a reference plane, the direction of the apogee or aphelion of its orbit, or the size of the major axis of its orbit. The main use of astronomical quantities specified in this way is to calculate other relevant parameters of motion, in order to predict future positions and velocities. The applied tools of the disciplines of celestial mechanics or its subfield orbital mechanics (for predicting orbital paths and positions for bodies in motion under the gravitational effects of other bodies) can be used to generate an ephemeris, a table of values giving ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telescope
A telescope is a device used to observe distant objects by their emission, Absorption (electromagnetic radiation), absorption, or Reflection (physics), reflection of electromagnetic radiation. Originally, it was an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects – an optical telescope. Nowadays, the word "telescope" is defined as a wide range of instruments capable of detecting different regions of the electromagnetic spectrum, and in some cases other types of detectors. The first known practical telescopes were refracting telescopes with glass lenses and were invented in the Netherlands at the beginning of the 17th century. They were used for both terrestrial applications and astronomy. The reflecting telescope, which uses mirrors to collect and focus light, was invented within a few decades of the first refracting telescope. In the 20th century, many new types of telescopes were invented, including radio telescopes in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Waterfall Nebula
A waterfall is any point in a river or stream where water flows over a vertical drop or a series of steep drops. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg or ice shelf. Waterfalls can be formed in several ways, but the most common method of formation is that a river courses over a top layer of resistant bedrock before falling onto softer rock, which erodes faster, leading to an increasingly high fall. Waterfalls have been studied for their impact on species living in and around them. Humans have had a distinct relationship with waterfalls since prehistory, travelling to see them, exploring and naming them. They can present formidable barriers to navigation along rivers. Waterfalls are religious sites in many cultures. Since the 18th century, they have received increased attention as tourist destinations, sources of hydropower, andparticularly since the mid-20th centuryas subjects of research. Definition and terminology A waterfall is g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NGC 1999
NGC 1999, also known as The Cosmic Keyhole, is a dust-filled bright nebula with a vast hole of empty space represented by a black patch of sky, as can be seen in the photograph. It is a reflection nebula, and shines from the light of the variable star V380 Orionis. It was previously believed that the black patch was a dense cloud of dust and gas which blocked light that would normally pass through, called a dark nebula. Analysis of this patch by the infrared telescope Herschel (October 9, 2009), which has the capability of penetrating such dense cloud material, resulted in continued black space. This led to the belief that either the cloud material was immensely dense or that an unexplained phenomenon had been detected. With support from ground-based observations done using the submillimeter bolometer cameras on the Atacama Pathfinder Experiment radio telescope (November 29, 2009) and the Mayall (Kitt Peak) and Magellan telescopes (December 4, 2009), it was determined that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NGC 1981
NGC 1981 (also known as OCL 525) is an open cluster which is located in the constellation Orion. It was discovered by John Herschel on 4 January 1827. Its apparent magnitude is 4.2 and its size is 28.00 arc minutes. It lies to the north of the Orion Nebula, separated from it by the Sh2-279 region containing NGC 1973, 1975, and 1977. Some say it looks like an alligator or crocodile, with its eastern star as the snout, its western star as its tail and the two groups of three stars in the middle of it as its two set of legs. References External links * Open clusters Orion molecular cloud complex 1981 Events January * January 1 ** Greece enters the European Economic Community, predecessor of the European Union. ** Palau becomes a self-governing territory. * January 6 – A funeral service is held in West Germany for Nazi Grand Admiral ... Orion (constellation) Astronomical objects discovered in 1827 Discoveries by John Herschel Orion–Cygnus Arm {{s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orion Molecular Clouds
The Orion Molecular Clouds (OMC) form collectively a filament cloud and are star-forming regions located behind the Orion Nebula and are seen as dark clouds between the Orion Nebula and Sh 2-279. The filament is part of the molecular cloud Orion A, which is part of the Orion molecular cloud complex. The Orion Molecular Clouds are divided into four parts: OMC-1, OMC-2, OMC-3 and OMC-4. Material in the OMCs and material in the foreground from the Orion Nebula prevent observations in shorter wavelengths and therefore the OMC is often observed with radio telescopes and with infrared telescopes. Orion Molecular Cloud 1 The OMC-1 is located behind the Orion Nebula. Most notable the OMC-1 contains the Kleinmann-Low nebula (KL nebula) in its center. While the KL nebula and the protostars in the core of OMC-1 are located only 90 arcseconds from the Trapezium cluster, the OMC-1 is actually a few tenths of a parsec behind the Trapezium cluster. The material of the OMC-1 shields the pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kleinmann–Low Nebula
The Kleinmann–Low Nebula (also known as the Orion KL Nebula) is an active star forming region and place of a past explosion event in the Milky Way galaxy. It is a cluster of stars within a molecular cloud.Ferland pp191 The Kleinmann–Low Nebula is at the heart of the Orion Nebula, and is the most active star-forming region in it. Because of the thick dust surrounding it, it is observed primarily with infrared light, since visible light cannot pass through it. Hot stellar winds circulate off large, young, stars in Orion's nebula and heat the surrounding gas. This then causes an explosion that has a finger-like intrusion look. It is named after Douglas Kleinmann and Frank J. Low, who discovered the nebula in 1967. Between 1972 and 1973 a large amount of maps were secured with the Steward and Catalina Observatories telescopes. The luminosity of the Kleinmann–Low Nebula is approximately , or roughly 105 times that of the sun, making the nebula the brightest component of the O ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Becklin–Neugebauer Object
The Becklin–Neugebauer Object (BN) is an object visible only in the infrared in the Orion molecular cloud 1 (OMC1). It was discovered in 1967 by Eric Becklin and Gerry Neugebauer during their near-infrared survey of the Orion Nebula. A faint glow around the center-most stars can be observed in the visible light spectrum, especially with the aid of a telescope. The BN Object is thought to be an intermediate-mass protostar. It was the first star detected using infrared methods and is deeply embedded within the Orion star-forming nebula, where it is invisible at optical wavelengths because the light is completely scattered or absorbed due to the high density of dusty material. Near-infrared polarized light observations showed that the star BN is still surrounded by a circumstellar disk. Past ejection of BN BN moves towards the northwest with respect to other stars in the Kleinmann-Low nebula. A proper motion of between 21 and 27 km/s in the northwest region and a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OMC-1
The Orion Molecular Clouds (OMC) form collectively a filament cloud and are Star formation, star-forming regions located behind the Orion Nebula and are seen as Dark nebula, dark clouds between the Orion Nebula and Sh 2-279. The filament is part of the molecular cloud Orion A, which is part of the Orion molecular cloud complex. The Orion Molecular Clouds are divided into four parts: OMC-1, OMC-2, OMC-3 and OMC-4. Material in the OMCs and material in the foreground from the Orion Nebula prevent observations in shorter wavelengths and therefore the OMC is often observed with Radio telescope, radio telescopes and with Infrared telescope, infrared telescopes. Orion Molecular Cloud 1 The OMC-1 is located behind the Orion Nebula. Most notable the OMC-1 contains the Kleinmann–Low Nebula, Kleinmann-Low nebula (KL nebula) in its center. While the KL nebula and the Protostar, protostars in the core of OMC-1 are located only 90 Minute and second of arc, arcseconds from the Trapezium Clus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
