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Thread: Errors in Death from the Skies

  1. #61
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    If you think people are being rude, report it.
    _____________________________________________
    Gillian

    "Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"

    "You can't erase icing."

    "I can't believe it doesn't work! I found it on the internet, man!"

  2. #62
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    same for you. The point it its not rude enough to report is it. Being sarcastic or snarky you can get away with. Being outright nasty you cannot.

  3. #63
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    The paperback edition is out.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  4. #64
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    hhEb09'1 - Did Phil ever end up getting on to Colbert? If so I must have missed it. If not, we must petition for this! 2 stars on one show - a binary episode.

  5. #65
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    Quote Originally Posted by hhEb09'1 View Post
    Page 205, DFTS; describes the red giant Sun swollen to 100 times its present radius. It mentions that the gravity at the surface will be less than 1 percent of Earth gravity.The square inches are measured at the current radius, I guess, before and after. By the time it gets to the surface of the red giant, the radiation per square inch will be 1/10,000 of that, right? But, wouldn't luminosity be related to the surface?
    If the Sun is 100 times bigger, it area will be 100 x 100 = 10,000 times bigger than today. However, on page 204 it says the luminosity will be 2,400 times as great. That means each square inch will be (2,400)/(10,000) or roughly 1/4 as luminous as today.

  6. #66
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    Quote Originally Posted by Ze_Kraggash View Post
    If the Sun is 100 times bigger, it area will be 100 x 100 = 10,000 times bigger than today. However, on page 204 it says the luminosity will be 2,400 times as great. That means each square inch will be (2,400)/(10,000) or roughly 1/4 as luminous as today.
    Yes, I think that was the point I was trying to make. I'll have to go back to the book to remember the context...

  7. #67
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    Remember that Luminosity per square inch varies with temperature to the fourth power, following the Stefan-Boltzmann law. The red giant sun will have a cooler surface temperature than its current temperature, and so the luminosity per square inch will be less then than it is now.

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