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Forum » SpaceEngine » Science and Astronomy Discussions » Galaxies thread (Discuss here any news or information about galaxies)
Galaxies thread
MartekDate: Saturday, 13.10.2012, 04:56 | Message # 1
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Photo below!



Link

https://sphotos-b.xx.fbcdn.net/hphotos....8_o.jpg

I find this amazing!





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HarbingerDawnDate: Saturday, 13.10.2012, 05:11 | Message # 2
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Martek, I edited the thread to make it more generalized. Otherwise, we just end up having a new thread for every little thing that someone feels like posting.

That is a very nice image. Unfortunately, not all the information in it is as accurate as it should be, or represented as it should be.





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MartekDate: Saturday, 13.10.2012, 05:38 | Message # 3
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Quote (HarbingerDawn)
Martek, I edited the thread to make it more generalized. Otherwise, we just end up having a new thread for every little thing that someone feels like posting.

That is a very nice image. Unfortunately, not all the information in it is as accurate as it should be, or represented as it should be.


Thank you! And, indeed. The image itself looks extremely nice. Ever wonder how bright the Galaxy would be if we were this far from it? I wish this bright! It looks so dim from Earth, it's a pity really sad





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apenpaapDate: Saturday, 13.10.2012, 10:27 | Message # 4
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^Well, you can find that out quite easily in SE. It says the Milky Way is about magnitude -1 at that distance. Keep in mind, however, that this is not like Sirius all concentrated in a single bright point: it's smeared out over about ten degrees of the sky. Given the lack of light pollution if you really were out there you would probably see it very brightly, but I don't think it's that much brighter than it is from Earth.




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HarbingerDawnDate: Saturday, 13.10.2012, 16:10 | Message # 5
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One way of thinking about it is to look at the Magellanic Clouds. The surface brightness of the Milky Way would probably be similar from a similar distance, so if you were only a few hundred thousand light years away it would probably be a spectacular sight. Relatively dim and diffuse, but spectacular. If you had a camera you could take a long exposure photo and get the shot of a lifetime smile




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SpaceEngineerDate: Saturday, 13.10.2012, 19:58 | Message # 6
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I have never seen the Magellanic clouds and Alpha Centauri. This is my dream! I envy people who live in southern hemisphere or near the equator!

In Northern hemisphere, we can look at the Andromeda galaxy - it can be seen with naked eye on quite a dark sky. Imagine its angular size 10 times greater, and you will have nice immersion on how our galaxy (and any other) looked from a distance. The surface brightness doesn't depend on distance, this is a key moment.

*





 
HarbingerDawnDate: Saturday, 13.10.2012, 20:27 | Message # 7
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Quote (SpaceEngineer)
The surface brightness doesn't depend on distance, this is a key moment.

I know that, it was a slight error in phrasing on my part. I meant apparent magnitude per unit of angular area.





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apenpaapDate: Saturday, 13.10.2012, 20:32 | Message # 8
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Yeah, the southern hemisphere gets most of the good stuff in the skies, between the Magellanic Clouds, Alpha Centauri, the centre of the Milky Way, Sirius, and more. Though I suppose Andromeda is nice too.




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HarbingerDawnDate: Saturday, 13.10.2012, 20:44 | Message # 9
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Sirius

Sirius is quite visible to most of the northern hemisphere. But most of the best stuff is in the southern sky.





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apenpaapDate: Saturday, 13.10.2012, 20:45 | Message # 10
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Yeah, that's true, and so is the centre of the Milky Way. They're still in the southern skies, however, and therefore never get high from the northern hemisphere.




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HarbingerDawnDate: Saturday, 13.10.2012, 20:57 | Message # 11
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They're still in the southern skies, however, and therefore never get high from the northern hemisphere.

Sirius gets high enough to be enjoyed (it's a star after all, it does not need to be very high to be seen clearly). But you're right, even at the best of times it is very hard to observe the galactic center from the northern hemisphere.





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apenpaapDate: Saturday, 13.10.2012, 21:14 | Message # 12
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Well, it depends on whether you're in a city or not, I guess. Sirius never gets much above the neighbours' roof here. Then again, I'm probably further north than you, since you're American.




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HarbingerDawnDate: Saturday, 13.10.2012, 21:31 | Message # 13
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I'm probably further north than you

True. I live at 42°N. And I'm not in a city, so I can see closer to the horizon than you can (though trees often get in the way).





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apenpaapDate: Saturday, 13.10.2012, 22:56 | Message # 14
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Yeah, you're a full ten degrees south of me. In vacation I discovered even five degrees south is a huge difference, as I could see Scorpio, Saggitarius, and the Milky Way's centre beautifully every evening in Austria at 47 degrees north. Where I live, Sirius and Antares never get much above the (heavily light-polluted) horizon, so while I can sometimes see them from the second floor they seem quite unimpressive compared to weaker stars that do get higher.




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HarbingerDawnDate: Saturday, 13.10.2012, 23:03 | Message # 15
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I can see Sagittarius as well, but because of light pollution the Milky Way's center (and all the rest of it as well) are invisible sad




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Forum » SpaceEngine » Science and Astronomy Discussions » Galaxies thread (Discuss here any news or information about galaxies)
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