Universe SandboxGeneral CategoryUniverse Sandbox v1 Discussion (2009 version)NGC 5195- Heading for Milky Way?
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Author Topic: NGC 5195- Heading for Milky Way?  (Read 744 times)
Arata
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« on: September 06, 2009, 05:14:24 PM »
Since in infrared, objects that are blue are moving towards you, while red moving way from you.
But M51's companion is blue in infrared.
Is it on a collision course with our Milky Way?
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monmarfori
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« Reply #1 on: September 06, 2009, 05:21:44 PM »
No. But Andromeda Will collide.
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Bla
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« Reply #2 on: September 06, 2009, 10:03:37 PM »
Blue in infrared? Infrared is fake colored, since it's invisible. Perhaps it could be colored in another way than just moving all the infrared wavelengths into the visible ones?
I don't know it though.

Could it be because it has many blue stars?
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atomic7732
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« Reply #3 on: September 06, 2009, 10:12:17 PM »
blue-shifted in infrared perhaps.Or if infrared was visible... well... then that would be blue-shifted.
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Bla
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« Reply #4 on: September 07, 2009, 06:43:55 AM »
Yes. If it was blue-shifted in infrared, it would turn normal red. Smiley
(or somewhere around)
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FGFG
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« Reply #5 on: September 07, 2009, 09:20:40 AM »
no...
The visible colours are decided by the people who made the image. They simply transformed the lenght of the light waves by a factor, which changes obviously.

However, maybe the image tells that the galaxy is getting nearer, but it doesn't mean that it will collide with us. An object can become nearer without colliding with us (e.g. the cars on the other lane).
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