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Thread: Can we see our sun 4 billion years ago?

  1. #1 Can we see our sun 4 billion years ago? 
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    The birth of our star happened roughly 4 billion years ago, and so about 4 light years away, 23.6 trillion miles in the past.

    Alpha Centuri is about the same age and we are able to observe it's light which is 2 million years old.

    So, can we observe light from our own sun at it's birth? If not, why so? Hmm, strange loop.


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  3. #2 Re: Can we see our sun 4 billion years ago? 
    Administrator KALSTER's Avatar
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    Quote Originally Posted by inite
    The birth of our star happened roughly 4 billion years ago, and so about 4 light years away, 23.6 trillion miles in the past.

    Alpha Centuri is about the same age and we are able to observe it's light which is 2 million years old.

    So, can we observe light from our own sun at it's birth? If not, why so? Hmm, strange loop.
    Alpha Centauri is something like 4.4 light years away from us. I think the 2 million year figure you are talking about is the time it takes for individual photons to reach the photosphere of our star from the core. The only way we can "look" at our star close to its birth is to look at a similar star at the same stage.


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  4. #3  
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    You could see the birth of our sun via very powerful telescope 4 billion+ lightyears away. This is of course very far away, outside our galaxy, and how one would get there is obviously a big issue - if not impossible :P
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  5. #4  
    Forum Ph.D. Leszek Luchowski's Avatar
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    And by the time you get there, the light you want to capture will be at least another 4bln light years away; you have no chance of catching up with it.

    What you can do is spend the next couple gazillon years building a very, very powerful telescope, then catch the first beams of our Sun as they arrive after having circled the Universe.

    If it does, of course - which I don't claim to know.
    Leszek. Pronounced [LEH-sheck]. The wondering Slav.
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  6. #5  
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    Some light reflects back. Therefore assuming that millions of reflective bodies exist at the right time/distance we're currently receiving a very faint image of the sun's formation. Look at it this way: if you had a very clear picture of the new moon you could detect a power-out in San Diego.
    A pong by any other name is still a pong. -williampinn
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  7. #6  
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    Quote Originally Posted by Pong
    Some light reflects back. Therefore assuming that millions of reflective bodies exist at the right time/distance we're currently receiving a very faint image of the sun's formation. Look at it this way: if you had a very clear picture of the new moon you could detect a power-out in San Diego.
    I suppose if you had an intact rock from it, you could detect the lights frequency and quantity with quantumphysics, eheheh, EH? Perhaps?
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