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Thread: First extrasolar planet from another galaxy

  1. #1 First extrasolar planet from another galaxy 
    Moderator Moderator Dishmaster's Avatar
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    European scientists (MPIA Heidelberg, Germany) have discovered the first extrasolar planet that was formed outside the Milky Way. Together with its host star, it originated from a dwarf galaxy that was swallowed by the Milky Way. The press releases can be found at this MPIA website and at ESO.


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  3. #2 Re: First extrasolar planet from another galaxy 
    Forum Professor arKane's Avatar
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    Quote Originally Posted by Dishmaster
    European scientists (MPIA Heidelberg, Germany) have discovered the first extrasolar planet that was formed outside the Milky Way. Together with its host star, it originated from a dwarf galaxy that was swallowed by the Milky Way. The press releases can be found at this MPIA website and at ESO.
    I agree that this is an interesting observation for a number of reasons. The fact that this planet has survived the red giant phase of it's star is of great interest, however I don't have a clear picture of what that star's current phase looks like. I always thought the red giant phase was the last stage before the star's ending, whatever that happens to be.

    It was also suggested that there may have been inner planets that didn't survive the red giant phase. But almost in the same breath it was stated that this star was a very poor in elements heavier than Helium. This would imply that there was a very low probability of any kind of rocky planet formation. So if there was any inner planets they were most likely also gas giants.

    Also the description of how the Milky Way absorbs a dwarf galaxy wasn't as complete as I was hoping for. There was nothing said about what happened to the central black hole of the dwarf galaxy, just the stars. To my way of thinking if there's no central black hole it's only a star cluster and not any kind of galaxy.


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