Nebulas | | | | | |
| | | | | | |  Automatic translation | | | | | | Nebula N81 | | All the pages       | | category : nebulas |  | | | | | N 81 is a cloud of reddening gas, which shelters from young and brilliant stud.
The reddish glow of this nebula is the result of the ultraviolet radiation emitted by its most brilliant two stars, 300 000 times as brilliant as the Sun.
N 81 is in the Small Cloud of Magellan, itself small satellite galaxy of the Milky Way.
The recent and massive stars inside N 81 lose their matter very quickly, creating powerful solar winds and shock waves drilling the cocoon of the outside nebula. The most brilliant both stars seen on the image of Hubble under the shape of a pair very moved closer near the center of N 81 emit strong ultraviolet radiations, returning the fluorescent nebula.
The images sent by Hubble show " that a heap of young massive stars is destroying its native cocoon. | | The small Cloud of Magellan (PNM), named according to the name of the explorer Ferdinand Magellan, is in 200 000 light years and is visible only since the southern hemisphere of the Earth.
N 81 is the 81st nebula cataloged in a study on the PNM driven by the astronomer Karl Henize in 1950, which afterward stole in the Space shuttle at time that astronaut. The presented image is a color representation of data obtained in September, 1997 with the camera WFPC2 of Hubble.* The nebula N81, the small cloud of Magellan | | 
| | | | | | | Tarantula Nebula or NGC 2070 | | | | | | | | | | The Tarantula Nebula is a gigantic factory of manufacturing of stars. It is the biggest nebula of known emission.
Placed at a distance 170 000 light years, she can be observed in the constellation of the Sea bream in the southern sky.
It belongs to one of the nearby galaxies of the Milky Way, the Big Cloud of Magellan.
The Nebula of the Tarantula contains more than half a million times the mass of the Sun, this vast and blazing cloud welcomes some of the most massive known stars.
The nebula owes its name to the arrangement of its most brilliant sectors which look like in a sense the legs of a spider.
They extend since a central "body" where a heap of warm stars (conscript R136) illuminates and structures the nebula.
This name of one of the biggest spiders ground, was chosen because of the colossal proportions of the nebula indeed, it measures almost 1 000 light years of wide and extends over more than a third of degree, is approximately the size of the full moon. | | If it was situated in our own galaxy, at the distance of another stellar nursery, the Nebula of Orion (distant from only 1500 light years), it would cover a quarter of the sky and would be visible even in broad daylight.
The astronomers realized this mosaic of four images to obtain a sight covering a square degree.
Every individual image containing 64 million pixels, the resultant mosaic contains 256 million pixels.
The image is based on data collected through four filters, among which two which draw the hydrogen (in red) and the oxygen (in green).
The ascendancy of the green in the image of the Tarantula results from the presence of the youngest and the warmest stars in this region.* Tarantula Nebula ou NGC 2070
ESO: photo realized on December 21st, 2006 | | 
| | | | | | | Butterfly Nebula or NGC 2346 | | | | | | | | | | The butterfly nebula is situated in the approximately 2 000 years light of the Earth in the direction of the constellation of the Unicorn.
It is the last moments of the spectacular system of binary stars that we see on the photo opposite in the center of the nebula.
These two stars are so close as they orbit the one around the other one in 16 days. Even with Hubble, the pair of stars cannot be seen as two separate constituents.
The astronomers think that one of the stars, by evolving developed to become a red giant and literally absorbed her companion.
Stars swirled together in spirals, and most of the external layers of the red giant were ejected in a dense disk which surrounds now the central star.
The nebula is also rich in clouds of dust, among which some form of long streak sink who point far from the central star. | | The spatial telescope Hubble arrested this image of the nebula in shape "of wing of butterfly", NGC 2346. * The Butterfly Nebula seen by the Hubble Space Telescope. | | 
| | | | | | | Horse's Head Nebula or Barnard 33 | | | | | | | | | | The Horsehead nebula (officially known under the name of Barnard 33; IC434 is a dark nebula in the constellation of Orion.
The nebula is just below Alnitak (ζ Ori), the star most east of the belt of Orion. This nebula, situated in 1500 light years was discovered for the first time in 1888 on a photographic plate taken in the look-out observatory of Harvard College.
It is easily recognizable by the shape at the head of horse which gave it its name. Indeed, behind the nebula is some hydrogen which, ionized by the brilliant star close Sigma Orionis, gives a red color.
The darkness of the head of horse is caused by the presence of a dense cloud of gas and dust. | | This last one absorbs strongly the visible radiation emitted by the gas ionized by back plan (red on the photo). On the base of the head, we find young stars in the process of formation. * Horse's Head Nebula or Barnard 33 | | 
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