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Sun has a twin!

  1. Oct 20, 2007 #1


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    I heard this the other day on a radio science program.

    from http://www.earthsky.org/radioshows/51873/the-sun-has-a-twin

    The star that is the sun's new twin - HD 101364 - also has the name HIP 56948.

    http://arxiv.org/abs/0709.4290 - HIP 56948: A Solar Twin With a Low Lithium Abundance


  2. jcsd
  3. Oct 20, 2007 #2
    Interesting article. However, if the sun is 1 billion years older than ours, that would suggest that if there is life on that solar system, it would be far superior to ours. So, how come they have not reached us yet. If we our sun is so identical, wouldn't they have picked up the similarities as well? Then again there could be life but maybe not nearly as advanced as us.
  4. Oct 20, 2007 #3
    Ah, it's not a longlost binary companion, then.
  5. Oct 20, 2007 #4


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    I think the estimate on age is +/- 1 billion yrs. I think the sun and HD 101364 are more or less the same in size, class and luminosity, but that doesn't necessarily imply simliarity with respect to a planetary system. On the other hand, that is very interesting if the sun formed with a planetary system and HD 101364 did not.
  6. Oct 20, 2007 #5
    True, there are a lot of factors to be considered, really all humanity can do is wait to advance in technology good enough to take us to other solar systems. For now we can only guess.
  7. Oct 20, 2007 #6


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    It's very true that an important factor is the probability that a sun similar to ours has planets orbiting it (isn't it one of the factors in the Drake equation?). And then there is the probability that a planet would be in the habitable range of possible orbits...and then that life would have formed and so on.

    But still, I find that the most exciting aspect is that a star so similar to ours has been found so darn close! I bet people will aim telescopes at it and listen in the water hole region of teh spectrum.

    Assuming that there are "people" there and that they would not be aiming any directed signals at us but that they have been broadcasting for more than 220 years, I assume that our technology is not advanced enough to monitor such stray signals from such a distance?
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