New view into M31


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Message boards : Science (non-SETI) : New view into M31

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Message 1063601 - Posted: 5 Jan 2011, 6:12:01 UTC

Ahoy, shipmates!

A new view into our closest galactic neighbour has been attained through composite imaging from two European Space Agency telescopes:


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PK
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Message 1064841 - Posted: 9 Jan 2011, 2:43:59 UTC

you know.. from seeing many different photos of many different galaxies, and some galaxy zoo attempts to classify by "type", it occurs to me, they all appear to be the same similar type, just viewed from an extremely wide variety of angles. Spirals one way, spiral the other way, line galaxy, simply depends on angle.

But they certainly are beautiful.
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Message 1064916 - Posted: 9 Jan 2011, 10:08:20 UTC - in response to Message 1064841.

Ahoy, shipmates!

But they certainly are beautiful.

Aren’t they indeed. See e.g. the National Geographic’s photo gallery:
http://science.nationalgeographic.com/science/photos/galaxies-gallery.html.

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PK
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Message 1065390 - Posted: 10 Jan 2011, 23:37:12 UTC - in response to Message 1064841.

you know.. from seeing many different photos of many different galaxies, and some galaxy zoo attempts to classify by "type", it occurs to me, they all appear to be the same similar type, just viewed from an extremely wide variety of angles. Spirals one way, spiral the other way, line galaxy, simply depends on angle.

The traditional system for classifying spiral and barred galaxies, due to Edwin Hubble, is based on the size of the hub or central concentration in relation to that of the disk, so the viewing angle is irrelevant. The divisions between classes aren't sharp, but in most cases experienced observers will agree on the category to which a given example belongs.

Elliptical galaxies show very little structure, if any at all, so their classification does depend on the angle of view, insofar as it determines the aspect ratio.

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Message 1065473 - Posted: 11 Jan 2011, 4:14:12 UTC - in response to Message 1065390.

galaxy zoo looks at many variables to label a galaxy anything from the central bulge to merging galaxies to the number of arms or even if it appears to be lensing distant objects.
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Message boards : Science (non-SETI) : New view into M31

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