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  Encyclopedia of Keywords > Science > Astronomy > Universe > Galaxies > Nebulae   Michael Charnine

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    This Review contains major "Nebulae"- related terms, short phrases and links grouped together in the form of Encyclopedia article.


  1. A nebulae is a cloud of gas and dust in outer space.
  2. Nebulae are classified in four major groups.
  3. Nebulae are the places where the stars are born.
  4. Nebulae are the basic building blocks of the universe where new stars and star systems are born.
  5. Other nebulae are formed by the death of stars; a star that undergoes the transition to a white dwarf blows off its outer layer to form a planetary nebula.

Distant Galaxies

  1. See his images of distant galaxies and nebulae.
  2. Included are some very attractive star clusters, really awesome bright nebulae, distant galaxies, and many "planetary" nebulae.
  3. In more distant galaxies, planetary nebulae may be the only objects that can be resolved to yield useful information about chemical abundances.


  1. These nebulae are areas of intense star formation within giant molecular hydrogen clouds.

Dark Nebulae

  1. Diffuse nebulae appear as light or dark clouds (called bright and dark nebulae), are irregular in shape, and range up to 100 light-years in diameter.
  2. Aquila and Delphinus, on the other hand, lie right along the Milky Way and contain some fine examples of planetary and dark nebulae.
  3. Dark nebulae are also often seen in conjunction with reflection and emission nebulae.


  1. You will become acquainted with double stars, variable stars, star clusters, nebulae and galaxies.


  1. The reddish areas are diffuse nebulae, mainly consisting of hydrogen, in the galaxy in which new stars are rapidly forming.
  2. Because both carbon and hydrogen were common in nebulae, hydrocarbon molecules are very common in space.
  3. Planets more than 1000 AU distant from their parent G, F or K type star to be able to hold hydrogen gas acquired from the gaseous nebulae.


  1. American astronomer who helped prove the true nature of galaxies, previously thought to be nebulae located within the Milky Way.


  1. Information on every item of interest you can think of: galaxies, double stars (optical and binary), variable stars, nebulae, etc.
  2. The database preferably includes information about stars, planets, and other celestial objects, such as nebulae.
  3. More information about this object can be found at the Web Nebulae - Little Dumbbell Nebula and at The Messier List - M76.


  1. A galaxy is a collection or grouping of stars, nebulae, gases, etc.


  1. Planetary Nebulae Observer's Home Page - THE site for planetary nebulae images, data, observing reports and lists.
  2. The appendix contains lists of variables in clusters and nebulae.


  1. The guy put together the ultimate "best of" list of galaxies, star clusters and nebulae.
  2. One of many planetary nebulae in this area is also on the list.


  1. Note to tourguide - if seeing is poor, you can skip this and pick up the topic of planetary nebulae with the Ghost of Jupiter.


  1. Planetary nebulae seem to mark the transition of a medium mass star from red giant to white dwarf.


  1. Explanation: The New General Catalog of star clusters and nebulae really isn't so new.
  2. We can then begin, for instance, to seek for an explanation of the formation of spiral nebulae.


  1. Many planetary nebulae, like the Ring, Nebula, M57, look great at 100 times, but are too dim to see well if you increase the magnification.


  1. The SAC Deep Sky Database contains information on over 10,000 star clusters, galaxies, and nebulae of all types.
  2. Examples of these types of nebulae are the Rosette Nebula and the Pelican Nebula.
  3. It contains open and globular star clusters, diffuse and planetary nebulae, supernova remnants and galaxies of all types.


  1. The comet of 1773 & 1774 has passed between these two nebulae on November 1 to 2, 1773.
  2. He discovered these three nebulae while observing this Comet which passed very close to them.


  1. It is an eclectic mix of clusters, galaxies, nebulae and stars that is sure to please all observers.
  2. Early observers of the 18th and 19th centuries classified what we now know are galaxies as "spiral nebulae".

Northern Hemisphere

  1. The Orion Nebula is arguably the finest of all nebulae within the Milky Way visible from the Northern Hemisphere.


  1. The first attempt to accurately draw the nebula (as part of a series of sketches of nebulae) was made by John Herschel in 1833, and published in 1836.
  2. They do not fit into the spiral or elliptical classes observed by Hubble and published in The Realm of the Nebulae in 1936.
  3. Steve was elected as a Fellow of the Royal Astronomical Society in 1987 and was the author of Planetary Nebulae, published by Willmann-Bell Inc in 1991.


  1. Johann Gottfried Koehler (December 15, 1745 - September 19, 1801) was a German astronomer who discovered a number of nebulae, star clusters, and galaxies.
  2. Every constellation contains a number of interstellar objects and phenomenon including stars, nebulae, and even entire galaxies.
  3. The area around these stars has a number of nebulae and clusters.


  1. It is one of the most distant nebulae ever observed, located in the Large Magellanic Cloud, a dwarf galaxy orbiting the Milky Way.
  2. Dark regions within the band, such as the Great Rift and the Coalsack, correspond to areas where light from distant stars is blocked by dark nebulae.
  3. Dark nebulae, also called dark clouds, are too distant from nearby stars to reflect their light or to be excited to emit light themselves.


  1. The apparent speed of the nebulae depends on the positions they occupy in their respective orbits at the time as well as on the observer's angle of sight.
  2. This class of nebulae, which are chiefly extended in length, but at the same time have a considerable breadth, is very numerous.
  3. So time to take a look at some of the nebulae within Orion.


  1. Stellar distances and distances to other gaseous nebulae are necessary for determining the mass distribution of our galaxy.
  2. Edwin Hubble and Milton Humason found distances to the spiral nebulae.
  3. A long standing problem in the study of planetary nebulae is that in most cases, their distances are very poorly determined.


  1. These nebulae are frequently illuminated by ultraviolet light which is emitted from the newborn stars.


  1. Observations of Nebulae and Clusters of Stars, made at Slough, with a Twenty-feet Reflector, between the years 1825 and 1833.
  2. Bigourdan won the Gold Medal of the Royal Astronomical Society in 1919 for his observations of nebulae for over 25 years.

Island Universes

  1. American astronomer whose observations proved that galaxies are "island universes", not nebulae inside our own galaxy.
  2. He became a proponent of the "island universes" hypothesis, which held that the spiral nebulae were actually independent galaxies.
  3. An Irishman who proposed the theory of island universes in the mid 1800's after observing spiral structure in several deep sky objects though to be nebulae.


  1. Observed the Sun, stars, planets and nebulae in the ultraviolet spectrum, which does not reach the Earth's surface.
  2. Smaller planetarium projectors include a set of fixed stars, Sun, Moon, and planets, and various nebulae.
  3. A typical planetarium projects the fixed stars, the sun, moon, and planets, and various nebulae.


  1. Two planetary nebulae take preeminence in a long list of other deep-sky objects in Aquarius.


  1. By studying the wealth of data revealed by HST, astronomers will understand better how stars form in the nebulae.
  2. Other nebulae may form as planetary nebulae.
  3. Let us imagine four nebulae in the form of spheres, all moving in a common orbit, in an anti-clockwise direction.


  1. As with all planetary nebulae, the expanding gas cloud that forms the visible nebula is illuminated by an extremely hot central star.
  2. They are physically very similar to reflection nebulae; they look different only because of the geometry of the light source, the cloud and the Earth.


  1. With a diameter of more than 200 light-years, it is one of biggest and brightest nebulae of our galaxy.
  2. Nov 15, 2009 - Kelly Whitt Winter's Brightest Nebulae Some of the brightest nebulae are found close together in the winter sky in the Northern Hemisphere.
  3. Surrounding the brightest stars are seen blue reflection nebulae caused by reflected light from many small carbon grains.


  1. Curtis on the other side contended that Andromeda and other such nebulae were separate galaxies, or "Island universes".
  2. Curtis was also correct that van Maanen's measurements of the rotation of these nebulae were inaccurate.
  3. Curtis, however, was correct that spiral nebulae are external galaxies.


  1. M42, M43 19.59 - Both nebulae in same FOV. M42 a beautiful blue object with vivid 3D like structure and well defined dark fish mouth.
  2. This structure likely tells us that this nebula has the barrel- or hourglass-like symmetry that has been revealed in many planetary nebulae.


  1. M (astronomy) (M), in astronomy, list of 110 star clusters, nebulae, and galaxies compiled by Charles Messier, who discovered many of them.
  2. While there is a little information to help you appreciate the images this is not a tutorial on the astronomy of nebulae.
  3. The dispute over the nature of what were once termed spiral nebulae stands as one of the most significant in the development of astronomy.


  1. A guide that includes over 1100 deep sky objects you can see with binoculars including globular clusters, double stars, binary star systems, and nebulae.
  2. The nebulae can be seen with binoculars from a dark location.

Naked Eye

  1. Planetary nebulae are generally faint objects, and none are visible to the naked eye.
  2. With the naked eye the comet looks as a large, diffuse nebulae.


  1. M8 is known as the Lagoon Nebula and is one of the most well known nebulae in the sky.
  2. Moreover, although the nebulae have large line-of-sight velocities, their positions on the sky have not changed detectably with time.
  3. This area of the sky, close to the richest region of the Milky Way, is filled with interesting objects like these nebulae.


  1. This illuminated globe shows stars, constellations, and nebulae when not lit.


  1. It is part of a giant molecular cloud which also contains the bright Horsehead and Orion nebulae.
  2. One of many diffuse nebulae in M33, NGC 604 is about 30 times larger in diameter than M42, the Great Nebula in Orion.
  3. Two more nebulae are on our list, M78 in Orion and the supernova remnant M1 (the Crab Nebula) in Taurus.


  1. In 1845, Lord Rosse constructed a new telescope and was able to distinguish between elliptical and spiral nebulae.


  1. Planetary nebulae, here represented by the Ring Nebula, are examples of emission nebulae.
  2. Emission Nebulae An emission nebula is a cloud of gas that emits photons of light.
  3. Emission nebulae contain ionized gas (mostly ionized hydrogen) that produces spectral line emission.


  1. Since the 1860's astronomers had been unable to identify many of the emission lines in the spectra of galactic nebulae.
  2. Huggins [Further Observations on the Spectra of some Nebulae, with a Mode of determining the Brightness of these Bodies.
  3. He also examined the spectra of nebulae and comets.


  1. This region of the sky, Sagittarius and its neighboring constellations, happens to be one that is dense with nebulae and young stars.
  2. The Veil Nebula, the Whirlpool Galaxy, a host of nebulae in the teapot of Sagittarius.
  3. Among nebulae, M17 in Sagittarius and the North American nebula (NGC 7000) in Cygnus are also readily viewed.


  1. These catalogs include (besides the usual round of clusters and nebulae) about 10,000 of the most conspicuous galaxies.


  1. Many of these nebulae, including some of the most prominent, are still known by his catalog numbers.
  2. It is one of the four planetary nebulae in that catalog, and situated in constellation Ursa Major.


  1. Though such nebulae are common in galaxies, this one is particularly large, nearly 1,500 light-years across.
  2. This dark tower, NGC 6231, and associated nebulae are about 5,000 light-years away.
  3. Explanation: A truly giant complex of emission nebulae, N44 is about 1,000 light-years across.


  1. Science > Astronomy > Universe > Galaxies
  2. Nebula
  3. Clusters
  4. Science > Astronomy > Astronomers > Messier
  5. Astronomy > Universe > Galaxies > Milky Way


Planetary Nebulae (1)
Eagle Nebula

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