martinsastro

Astronomy for all.
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Lester.jpg

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Dargo to Licola


IMG_0518.jpg

18 files, last one added on May 21, 2016
Album viewed 318 times

Camper trailer files.



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JenJenJen.jpg
JenJenJen.jpg604 viewsMartin
etacrop.jpg
etacrop.jpgEta Carinae nebula.704 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
NGC4945_supernova.jpg
NGC4945_supernova.jpgNGC4945731 viewsNGC4945 with the supernova 2011ja (January 01-2012).Martin
47Tucmoreblue2Gig.jpg
47Tucmoreblue2Gig.jpg47tuc644 viewsfor Trevor :)Martin
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IMG_0509.jpg356 viewsNice view 2Martin
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good.jpgNGC6188777 viewsMartin
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Sombrerocropdone.jpgSombrero galaxy1749 viewsThe Sombrero Galaxy (also known as M104 or NGC 4594) is an unbarred spiral galaxy in the constellation Virgo located 28 million light years from Earth. It has a bright nucleus, an unusually large central bulge, and a prominent dust lane in its inclined disk. The dark dust lane and the bulge give this galaxy the appearance of a sombrero. Astronomers initially thought that the halo was small and light, indicative of a spiral galaxy. But Spitzer found that halo around the Sombrero Galaxy is larger and more massive than previously thought, indicative of a giant elliptical galaxy. [5] The galaxy has an apparent magnitude of +9.0, making it easily visible with amateur telescopes. The large bulge, the central supermassive black hole, and the dust lane all attract the attention of professional astronomers.Martin
Dougs_G11.jpg
Dougs_G11.jpg574 viewsMartin

Last additions
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IMG_0518.jpgnice view979 viewsnice viewMartinMay 21, 2016
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IMG_0517.jpgARB Kev1034 viewsARB Kev.MartinMay 21, 2016
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IMG_0516.jpg500 viewsKev's CarMartinMay 21, 2016
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IMG_0515.jpg506 viewsJacki and carMartinMay 21, 2016
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IMG_0514.jpg503 viewsAlex's carMartinMay 21, 2016
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IMG_0513.jpg514 viewsScotty's carMartinMay 21, 2016
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IMG_0512.jpg511 viewsMark beside his carMartinMay 21, 2016
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IMG_0511.jpg504 viewsHang this in the ceiling and Mark will be out of business :PMartinMay 21, 2016