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Nebulas

    

automatic translation

    
What a nebula? [Fast reading of the page] Of the Latin ' nebula ' which wants to say cloud, clouds of gas and dusts in the middle of stars, nebulas are at the same moment active crèches and cemeteries of stars. These magnificence of the sky are enlightened by the stars which they contain or by stars situated behind them. It is the most beautiful images of astronomy that we can obtain at present.  

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From Latin ' nebula ' which wants to say cloud, clouds of gas and dusts in the middle of stars, nebulas are at the same moment active crèches and cemeteries of stars.
These magnificence of the sky are enlightened by the stars which they contain or by stars situated behind them.
It is the most beautiful images of astronomy that we can obtain at present.
Nebulas make us admire in the field of the telescope of magnificent conglomerations of stars and gas flooding the sky. More the telescope is powerful more the images are magnificent.
Only long poses will reveal the whole palette of colors in particular the surprising pink color of the hydrogen. William Hershel discovered the dark nebulas, the clouds of gas and dusts without star, too dense to allow to pass the light of stars situated behind.
 Notes:
ESA (European Space Agency)
European Southern Observatory (ESO, the European Organization for Astronomical Research in the Southern Hemisphere.
NGC (New General Catalog) is one of the best known catalogs in the field of amateur astronomy with the Messier catalog.

In one image every splendors of the constellation Orion: (from left to right) the Flame Nebula and its dark channels (NGC 2024), the head of Horse or Barnard 33, NGC 1977 (purple and blue) and the Orion Nebula or M 42 (red-orange center right).

 

     

The Crab Nebula or M1 or NGC 1952

 

category : nebulas


    

The Crab Nebula or M1 is the typical result of a starburst or visible residue of the explosion of a supernova. This supernova exploded in 1054, observed by several astronomers of the Far East from July 1054 to April 1056.
These mysterious filaments, are not only extremely complex, but seem to have less mass than the original supernova and higher speed than expected. It is situated at a distance of about 2 kiloparsecs is 6300 light years from Earth in the constellation Taurus. The nebula has a diameter of 11 light years and its expansion velocity is 1500 km / s. This is the first astronomical object that has been identified with a supernova explosion. In the center of the nebula is a pulsar, that is to say, a neutron star as massive as the Sun but with only the size of a small town.
The Crab Pulsar rotates on itself at a speed of 30 times per second. It radiates about 200,000 times more energy than the Sun and this in an extremely wide frequency range. A supernova is the visible phenomenon, directly from the cataclysmic explosion of a star that leads to its total destruction and therefore the death of the star. This explosion is accompanied by a gigantic increase its brightness as seen from Earth, which can last several weeks and even months.

 

It is visible in daylight and at night it can be as bright as the moon and even give a shadow objects.
A supernova is therefore often as a new star, whence its name, nova. Supernovae are rare events in our Milky Way, about one to three per century, by cons across the universe, we observe every day.
It was during the supernova explosion the star releases its chemical elements synthesized during its existence and after the explosion itself.
The shockwave from the supernova favors the formation of new stars accelerating contraction of regions of gas and dust in the interstellar medium.
The novae, unlike supernovae are thermonuclear explosions from causing a partial destruction of the star by expelling a portion of its surface into interstellar space.

astronoo The Crab Nebula or M1 is the typical result from a star explosion. The death of a star can be mild or severe, depending on its mass.
Picture taken by the Hubble Space Telescope.

 

Crab Nebula or M1 or NGC 1952

     
Thor's Helmet Nebula or NGC 2359    

    
This emission nebula in the form of winged helmet suggestive is commonly called The Helmet of Thor. The diameter of a helmet suitable Norse god, is 30 light years. In fact, the helmet is a bubble of interstellar matter, blown by wind energy from the central star is extremely hot, massive and bright, created in the surrounding molecular cloud.
Identified as a Wolf-Rayet star, the central star is a giant star extremely hot.
The stars of Wolf-Rayet stars are rare blue giants which develop stellar winds traveling millions of miles per hour.
Interaction with a large molecular cloud close to contribute to complex shapes and structures of curved arches shock of this nebula.
We think she is going through a very brief phase of its evolution prior to its supernova explosion.
 Cataloged under number NGC 2359, the nebula is located 15,000 light years away in the constellation Canis Major. This sharp image shows remarkable detail structures in the filaments of the nebula. It also sees the colors of emerald due to emission of oxygen atoms around the luminescent gas.

astronoo  The emission nebula visible here, is known by the name of Thor's Helmet or NGC 2359 in the constellation Canis Major.
Credit and Copyright: Star Shadows Remote Observatory & PROMPT / UNC (Steve Mazlin, Jack Harvey, Rick Gilbert, and Daniel Verschatse)

 

Thor's Helmet Nebula or NGC 2359

     

Related subjects

    

    

Galaxy groups

  Constellations  
Nebulas    

 

    

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Astronomy - October 15, 2007