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  1. #41
    Justinmcg67's Avatar
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    Quote Originally Posted by Voyager3 View Post
    If that were to happen all at the same time, you can bet it would be cloudy for the whole thing!
    Oh of course! While anything important is happening we get cloudy skies. I'm sure if a comet was to come into view, there would be clear sky to the left and right but a giant mass of clouds over my house, just enough for me not to observe.

    I think one thing is for-certain: there will be clouds. Oh, oh how I hate the clouds.

    Oh a side note, if the Sun turns to a Red Giant, does this translate into more solar storms, or not? Because it turns to a red giant when all the fuel is spent correct?

  2. #42
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    Let's start with the first scenario. That's correct, due to tidal friction, the moon's orbital size is increasing. The earth rotating faster than the orbital period of the moon, due to conservation of angular momentum, energy is transferring from the earth to the moon, add energy, the moon gets higher, the earth's rotational period slows down, the day is longer. At some point the day and the month will be equal. But, alas, the same thing is happening between the earth and the sun. The sun rotates faster than the earth's orbital period, transferring energy to earth's orbit, the AU gets bigger (about a half million miles or so since the birth of the solar system. Also, the earth's day will continue to slow down due to tidal friction with the sun, as it does, orbital momentum will transfer energy from the moon to the earth, the moon's orbit will then get smaller. Eventually, the moon will reach earth's Roche limit and we will become a mini-Saturn.
    In the second scenario, the sun's luminosity is increasing-it's 30% brighter than it was when it started. So, in a half-billion years or so, it'll get hot enough to boil away the oceans. Then, 5-7 billion years, the sun will become a red giant. No one knows if the size of the sun will be big enough to suck up the earth or not.
    In the third scenario, M32 and Milky Way will collide. The first will be just a 'flyby' where they pass each other, then later will combine into one galaxy. Later, the triangulum galaxy will join the crowd. Perhaps one or two bodies may collide, but most will just merge into the new galaxy, not unlike traffic on the expressway.
    It's unknown when each of these happens, so, it's unknown which will beat the other. A lot of this stuff I got from an old college level text from about 1968.

  3. #43
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    Default Re: Sun Explodes/Moon goes Away?

    even if moon is moving away from the earth,the spiral movement will make the distance greater over the time..and the number will keep growing.

  4. #44
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    Default Re: Sun Explodes/Moon goes Away?

    It has already been established that even though the moon is receding from the earth at a very slow rate it will still be orbiting the earth when the sun expands and consumes them both, so why worry about a scenario that won't happen?
    Bob DeWoody

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    Isn't the moon somewhat responsible for the Earth's tilt and therefor our seasons....

    Here's a great documentary by the BBC if anyone has an hour to kill..... Do We Really Need The Moon?

    http://m.youtube.com/watch?v=tMAC0ZZxZC4

  6. #46
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    Default Re: Sun Explodes/Moon goes Away?

    Here is an interesting book that explores many of the "what if?" scenarios in astronomy:

    Amazon.com: What If the Moon Didn't Exist?: Voyages to Earths That Might Have Been (9780060168643): Neil F. Comins: Books

    The topics aren't just limited to the Moon, IIRC the author also looks at life on Earth in the event of a nearby (~ 50 LY) supernova and other cosmic happenings.

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    Default Re: Sun Explodes/Moon goes Away?

    Quote Originally Posted by Justinmcg67 View Post
    So, I've often pondered this question and after thinking about it for a few minutes I decided to share it with everyone.

    Which will happen first: The Sun exploding/expanding, or, the Moon leaving Earth's orbit?

    I know that the Moon travels roughly 1 inch away from Earth every year. However, what I don't know is at what distance it takes for the Moon to have an effect of null on the Earth and basically end the world as we know it. It's also estimated that ti will take a few billion years for the sun to run out of juice and expand to eventually engulf the Earth and most planets in the solar system.

    I think the Sun will explode/expand before the Moon could be far enough away to end the planet as we know it. However, I'm not to sure.

    What do you guys think? Also, I haven't found anything related to these two topics in comparison, so any info you may have or find, is very much welcome!
    Dang. Something new to worry about.

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