martinsastro

Astronomy for all.
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132 files in 12 albums and 1 categories with 0 comments viewed 75,743 times

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Lester.jpg

1 files, last one added on Dec 26, 2011
Album viewed 302 times

Dargo to Licola


IMG_0518.jpg

18 files, last one added on May 21, 2016
Album viewed 128 times

Camper trailer files.



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IMG_0517.jpg
IMG_0517.jpgARB Kev471 viewsARB Kev.Martin
Tarantula-done.jpg
Tarantula-done.jpgTarantula nebula.781 viewsThe Tarantula Nebula (also known as 30 Doradus, or NGC 2070) is an H II region in the Large Magellanic Cloud. It was originally thought to be a star, but in 1751 Nicolas Louis de Lacaille recognized its nebular nature.

The Tarantula Nebula has an apparent magnitude of 8. Considering its distance of about 49 kpc[2] (160,000 light years), this is an extremely luminous non-stellar object. Its luminosity is so great that if it were as close to Earth as the Orion Nebula, the Tarantula Nebula would cast shadows. In fact, it is the most active starburst region known in the Local Group of galaxies. It is also the largest such region in the Local Group with an estimated diameter of 200 pc.[3] The nebula resides on the leading edge of the LMC, where ram pressure stripping, and the compression of the interstellar medium likely resulting from this, is at a maximum. At its core lies the compact star cluster R136 (approx diameter 35 light years)[4] that produces most of the energy that makes the nebula visible. The estimated mass of the cluster is 450,000 solar masses, suggesting it will likely become a globular cluster in the future.
Martin
Angus.jpg
Angus.jpg433 viewsMartin
rosettecropfinal.jpg
rosettecropfinal.jpgRosette nebula.510 viewsThe cluster and nebula lie at a distance of some 5,200 light years from Earth (although estimates of the distance vary considerably) and measure roughly 130 light years in diameter. The radiation from the young stars excite the atoms in the nebula, causing them to emit radiation themselves producing the emission nebula we see. The mass of the nebula is estimated to be around 10,000 solar masses.

It is believed that stellar winds from a group of O and B stars are exerting pressure on interstellar clouds to cause compression, followed by star formation in the nebula. This star formation is currently still ongoing.

A survey of the nebula with the Chandra X-ray Observatory in 2001 has revealed the presence of very hot, young stars at the core of the Rosette Nebula. These stars have heated the surrounding gas to a temperature in the order of 6 million kelvins causing them to emit copious amounts of X-rays.
Martin
Dazza_and_my_scope_on_right.jpg
Dazza_and_my_scope_on_right.jpg4782 viewsMartin
Lester.jpg
Lester.jpgMore data.309 viewsMartin
centaurus-A.jpg
centaurus-A.jpgCentaurus A.544 viewsThe Centaurus A/M83 Group is a complex group of galaxies in the constellations Hydra, Centaurus, and Virgo. The group may be roughly divided into two subgroups. The Cen A Subgroup, at a distance of 11.9 Mly (3.66 Mpc), is centered around Centaurus A, a nearby radio galaxy.[3] The M83 Subgroup, at a distance of 14.9 Mly (4.56 Mpc), is centered around the Messier 83 (M83), a face-on spiral galaxy.[3]

This group is sometimes identified as one group[4][5] and sometimes identified as two groups.[6] Hence, some references will refer to two objects named the Centaurus A Group and the M83 Group. However, the galaxies around Centaurus A and the galaxies around M83 are physically close to each other, and both subgroups appear not to be moving relative to each other.[3]

The Centaurus A/M83 Group is part of the Virgo Supercluster, the local supercluster of which the Local Group is an outlying member.
Martin
Fog.jpg
Fog.jpg425 viewsMartin

Last additions
IMG_0518.jpg
IMG_0518.jpgnice view406 viewsnice viewMartinMay 21, 2016
IMG_0517.jpg
IMG_0517.jpgARB Kev471 viewsARB Kev.MartinMay 21, 2016
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IMG_0516.jpg293 viewsKev's CarMartinMay 21, 2016
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IMG_0515.jpg300 viewsJacki and carMartinMay 21, 2016
IMG_0514.jpg
IMG_0514.jpg297 viewsAlex's carMartinMay 21, 2016
IMG_0513.jpg
IMG_0513.jpg296 viewsScotty's carMartinMay 21, 2016
IMG_0512.jpg
IMG_0512.jpg306 viewsMark beside his carMartinMay 21, 2016
IMG_0511.jpg
IMG_0511.jpg299 viewsHang this in the ceiling and Mark will be out of business :PMartinMay 21, 2016