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| 132 files in 12 albums and 1 categories with 0 comments viewed 73,273 times |
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dumbbellcrop.jpgDumbbell nebula.459 viewsThe Dumbbell Nebula (also known as Messier 27, M 27, or NGC 6853) is a planetary nebula (PN) in the constellation Vulpecula, at a distance of about 1,360 light years.
This object was the first planetary nebula to be discovered; by Charles Messier in 1764. At its brightness of visual magnitude 7.5 and its diameter of about 8 arcminutes, it is easily visible in binoculars, and a popular observing target in amateur telescopes.Martin
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etacrop.jpgEta Carinae nebula.541 viewsThis stellar system is currently one of the most massive that can be studied in great detail. Until recently, Eta Carinae was thought to be the most massive single star, but it was recently demoted to a binary system.[7] The most massive star in the Eta Carinae multiple star system has more than 100 times the mass of the Sun. Other known massive stars are more luminous and more massive.
Stars in the mass class of Eta Carinae, with more than 100 times the mass of the Sun, produce more than a million times as much light as the Sun. They are quite rare — only a few dozen in a galaxy as big as the Milky Way. They are assumed to approach (or potentially exceed) the Eddington limit, i.e., the outward pressure of their radiation is almost strong enough to counteract gravity. Stars that are more than 120 solar masses exceed the theoretical Eddington limit, and their gravity is barely strong enough to hold in their radiation and gas.
Eta Carinae's chief significance for astrophysics is based on its giant eruption or supernova impostor event, which was observed around 1843. In a few years, Eta Carinae produced almost as much visible light as a supernova explosion, but it survived. Other supernova impostors have been seen in other galaxies, for example the false supernovae SN 1961v in NGC 1058[8] and SN 2006jc in UGC 4904,[9] which produced a false supernova, noted in October 2004. Significantly, SN 2006jc was destroyed in a supernova explosion two years later, observed on October 9, 2006.[10] The supernova impostor phenomenon may represent a surface instability[11] or a failed supernova. Eta Carinae's giant eruption was the prototype for this phenomenon, and after nearly 170 years the star's internal structure has not fully recovered.Martin
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testing.jpgtestimage961 views2X30Seconds at ISO1600Martin
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IMG_0499.jpg208 viewsMark swinging the log splitterMartin
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IMG_0506.jpg201 viewsCamp fire at WonangattaMartin
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Chicken-done2G.jpgChicken nebula.517 viewsJust testing the guiding on the G11 with Gemini 2Martin
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IMG_0518.jpgnice view349 viewsnice viewMartinMay 21, 2016
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IMG_0517.jpgARB Kev413 viewsARB Kev.MartinMay 21, 2016
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IMG_0516.jpg272 viewsKev's CarMartinMay 21, 2016
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IMG_0515.jpg281 viewsJacki and carMartinMay 21, 2016
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IMG_0514.jpg279 viewsAlex's carMartinMay 21, 2016
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IMG_0513.jpg276 viewsScotty's carMartinMay 21, 2016
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IMG_0512.jpg285 viewsMark beside his carMartinMay 21, 2016
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IMG_0511.jpg280 viewsHang this in the ceiling and Mark will be out of business :PMartinMay 21, 2016
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