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Thread: Question about moving objects in space

  1. #1 Question about moving objects in space 
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    Hi. I'm not sure if this is posted in the right place or a stupid question, but I'll never know if I don't ask ey.My question is... If an object in space is moving rapidly away from you, how would it appear from your stationary point?From reading around and my school knowledge I believe this may be similar to the Doppler effect and/or redshift?I get that we would receive the photons of light in increasing intervals due to the increasing distance between us and the object, but how would this look? Would the object appear to be slowing down because we receive less from it?Again, apologies if it is a stupid question or if I have said something that is completely wrong.


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    The Enchanter westwind's Avatar
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    Hi Sawon. It's not a stupid Question. I've never seen or heard a stupid question. Uninformed, yes. Thoughtless, yes. Distracting, yes. But the brain and thought process just needs fine tuning. We are all contributing in our own way. This is a good Science Question. I call upon a friend of mine in this Forum to answer your Question. I would only be surmising as I do not know the correct answer. Welcome to Science Forum. westwind.


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    Ascended Member Ascended's Avatar
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    Quote Originally Posted by Sawon View Post
    Hi. I'm not sure if this is posted in the right place or a stupid question, but I'll never know if I don't ask ey.My question is... If an object in space is moving rapidly away from you, how would it appear from your stationary point?From reading around and my school knowledge I believe this may be similar to the Doppler effect and/or redshift?I get that we would receive the photons of light in increasing intervals due to the increasing distance between us and the object, but how would this look? Would the object appear to be slowing down because we receive less from it?Again, apologies if it is a stupid question or if I have said something that is completely wrong.
    Yes you are correct what you are actually observing is the frequecy of the light waves becoming stretched and slowing down, the further the object moves away the longer it takes each light wave to reach the observer and the greater the distance between actual light waves. This is why the change to redshift occurs.

    For a more detailed explanation see:

    Doppler effect - Wikipedia, the free encyclopedia
    Everything has its beauty, but not everyone sees it. - confucius
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    Universal Mind John Galt's Avatar
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    Your answer is misleading Chris. You have just told Sawon that he is correct: the object would appear to be slowing down. That is not the case. The other part of Sawon's suggestion - the part I think you were focused on - is valid. There is a Doppler effect and the object woul appear 'redder'. With no intention to be trite, the most obvious effect would be that it appears to get smaller.
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    Quote Originally Posted by John Galt View Post
    Your answer is misleading Chris. You have just told Sawon that he is correct: the object would appear to be slowing down. That is not the case. The other part of Sawon's suggestion - the part I think you were focused on - is valid. There is a Doppler effect and the object woul appear 'redder'. With no intention to be trite, the most obvious effect would be that it appears to get smaller.
    Apologies, thanks for the correction, I should have been clearer, with that the light waves slows due to the increased distance they are then traveling and time between them increases, this of course does not effect the actual objects rate of velocity.
    Everything has its beauty, but not everyone sees it. - confucius
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    Universal Mind John Galt's Avatar
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    Again, be careful. The light wave does not slow, but the wave is stretched over a longer distance - wavelength increases. c is a constant.
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    Okay, I understand better now. Thanks for the replies
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    Forum Bachelors Degree dmwyant's Avatar
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    So in a case of an object moving toward us would we experience a blueshift as the wave frequency compresses?
    Not all who wander are lost... Some of us just misplaced our destination.

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    That's correct.
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