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How many galaxies do we know about?
Topic Started: Dec 28 2009, 12:00 AM (794 Views)
thecostumedanceparty
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Just wondering... also how many planets and moons in the known galaxies?
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Michelle
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http://en.wikipedia.org/wiki/Third_Cambridge_Catalogue_of_Radio_Sources

http://en.wikipedia.org/wiki/List_of_NGC_objects

http://en.wikipedia.org/wiki/List_of_Abell_clusters

7840+
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thecostumedanceparty
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Lookerisawesome
Dec 28 2009, 02:44 AM
Thanks, but I'll admit those wikipedia sources are way too advance for me.

Anyway, do we know of any planets outside our initial galaxy? Do we know of life on them?
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CJ
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A very minor case of serious brain damage

One may have been discovered in the Andromeda Galaxy, although there are likely many more that we haven't yet discovered:

http://www.thaindian.com/newsportal/health/first-planet-spotted-outside-the-milky-way-may-lie-in-andromeda-galaxy_100205070.html

At the moment, there aren't any known planets with life on (excluding the Earth, of course), but who knows? Maybe, we'll find some one day.
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thecostumedanceparty
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KingsIndian
Dec 28 2009, 12:32 PM
One may have been discovered in the Andromeda Galaxy, although there are likely many more that we haven't yet discovered:

http://www.thaindian.com/newsportal/health/first-planet-spotted-outside-the-milky-way-may-lie-in-andromeda-galaxy_100205070.html

At the moment, there aren't any known planets with life on (excluding the Earth, of course), but who knows? Maybe, we'll find some one day.
Cool, I wish there were like dimensional graphs of it though.
Edited by thecostumedanceparty, Dec 28 2009, 03:25 PM.
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CJ
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A very minor case of serious brain damage

Sorry; I'm not quite sure what you mean. Could you please explain?
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Michelle
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The Morphological Catalogue of Galaxies (MCG) or Morfologiceskij Katalog Galaktik, is a Russian catalogue of 30642 galaxies compiled by Boris Vorontsov-Velyaminov and V. P. Arkhipova.


Galaxy Zoo is an online astronomy project which invites members of the public to assist in classifying over a million galaxies. It is an example of citizen science as it enlists the help of members of the public to help in scientific research. An improved version — Galaxy Zoo 2 — went live on 17 February 2009.
Edited by Michelle, Dec 30 2009, 05:45 AM.
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CJ
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A very minor case of serious brain damage

According to this, there are hundreds of billions of galaxies in the universe, but only about 3,000 of them are currently visible.
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thecostumedanceparty
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KingsIndian
Dec 28 2009, 05:50 PM
Sorry; I'm not quite sure what you mean. Could you please explain?
I wish there was some picture or something that could show the galaxies we know about in the universe.
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CJ
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Well, it'd have to be a very big picture, since there are so many of them :P . It'd also be difficult to represent on paper, since space has three dimensions and paper only two.
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thecostumedanceparty
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KingsIndian
Dec 30 2009, 06:57 PM
Well, it'd have to be a very big picture, since there are so many of them :P . It'd also be difficult to represent on paper, since space has three dimensions and paper only two.
Well, did they name any of the planets in another galaxy... I'd like to know more about them. Besides, are there any more planets (or dwarf planets) in our own galaxy?
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CJ
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A very minor case of serious brain damage

The chances are there are loads more in our own galaxy. We know of 400 planets in our galaxy, but so far, we've only been able to search a very small part of it.
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thecostumedanceparty
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KingsIndian
Dec 30 2009, 07:00 PM
The chances are there are loads more in our own galaxy. We know of 400 planets in our galaxy, but so far, we've only been able to search a very small part of it.
Then how do they actually know? And how come they are so far from the sun? They probably aren't suitable for life?
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CJ
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A very minor case of serious brain damage

I'm not sure about the details of how these planets are discovered, but I know it has to do with the Doppler Effect.

Well, they orbit other stars instead of the Sun. It's unlikely that they're suitable for life...but, who knows?
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Michelle
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In 2154, the RDA corporation is mining Pandora, a lush, Earth-like moon of the planet Polyphemus, in the Alpha Centauri system.[16] Parker Selfridge (Giovanni Ribisi), the administrator, employs former marines as mercenaries to provide security. The humans aim to exploit Pandora’s reserves of a valuable mineral called unobtanium.
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CJ
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A very minor case of serious brain damage

Where's that from :S ? Sounds like some kind of science fiction novel...
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Michelle
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It's the setting for Avatar. XD
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CJ
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A very minor case of serious brain damage

Oh, OK.

I guess something like that could be happening somewhere...you never know!
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Michelle
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I think maybe so.
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CJ
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A very minor case of serious brain damage

I'd be interested to see whether there are any aliens that look anything like humans.
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thecostumedanceparty
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If there's billions of planets like you say, it's hard to believe that no two are alike... which is why I think there could be another Earth-like planet, especially since Venus and Mars are (somewhat) similar. Of course, no two could be exact either (I don't think anyway).
Edited by thecostumedanceparty, Dec 31 2009, 06:30 PM.
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CJ
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A very minor case of serious brain damage

I suppose even on those planets that are capable supporting life, the conditions will vary quite a lot. Some of these conditions may very well favour, say, insects over mammals, so the dominant species there may well be large insects. With that said, there will probably be some with conditions similar to Earth.
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Michelle
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KingsIndian
Dec 31 2009, 10:20 AM
I'd be interested to see whether there are any aliens that look anything like humans.
Maybe in a billion years :P
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Michelle
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I heard that there's at least 780 billion galaxies.
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CJ
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A very minor case of serious brain damage

This page isn't quite so optimistic. It says there might only be 100-200 billion:

http://www.universetoday.com/30305/how-many-galaxies-in-the-universe/
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Michelle
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That doesn't seem like that many...
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CJ
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A very minor case of serious brain damage

I guess not, but it did say another estimate was 500 billion.

Still lower than the numbers I'm used to from astronomy, though.
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Michelle
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That's an insane amount... just think about it.
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CJ
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Well, compared to 780 billion, it isn't really :P .
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