# Thread: Sun Explodes/Moon goes Away?

1. ## Sun Explodes/Moon goes Away?

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!

2. If the sun blows in five billion years or so as currently expected. The moon will be roughly a million miles from Earth at that time by way of simple arithmetic, assuming my math is correct. At that distance, the moon will most likely still be attached to earth in the satellite and gravitational sense.

3. Originally Posted by Lj3d
If the sun blows in five billion years or so as currently expected. The moon will be roughly a million miles from Earth at that time by way of simple arithmetic, assuming my math is correct. At that distance, the moon will most likely still be attached to earth in the satellite and gravitational sense.
Is there any data that suggest what impact that distance would have on the oceans, sun light, etc?

4. Well, the tides would be smaller. It wouldn't be too hard to calculate roughly how much smaller.

There's no reason why the Moon's distance would affect sunlight. It would affect moonlight. At four times its current distance, we'd get roughly 1/16 the moonlight. Better for DSO observing!

There's no reason to think that the Moon receeding to a greater distance or leaving the Earth's orbit altogether would have any more than a minor effect on the Earth. It makes our life interesting, but we are not dependent on it.

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6. So, the Sun is supposed to explode/expand in roughly 5 billion years. Well, here's a twist. I read about ten minutes ago that the Andromeda and Milky Way are to crash together within 3 billion years.

Either way, I think Earth is screwed, whichever comes first.

7. Originally Posted by Justinmcg67
So, the Sun is supposed to explode/expand in roughly 5 billion years. Well, here's a twist. I read about ten minutes ago that the Andromeda and Milky Way are to crash together within 3 billion years.

Either way, I think Earth is screwed, whichever comes first.
This "collision" will take place over many millions of years (maybe billions) and will probably have almost no apparent effect on the Earth. There is simply too much space between all those stars.
If anything, it would most likely start a new burst of star formation throughout the "new" galaxy.

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Voyager3 (03-28-2012)

9. Maybe we will get ejected from the suns orbit and get a new star before Sol blows.

Jim

10. Originally Posted by KeithBC
but we are not dependent on it.
From my research I believe we are somewhat dependent upon the moon from the aspect of the promotion of life and evolution as we know it, and relative climate stabilization. The moon gives us a reasonably stable axial tilt, thus promoting a smoothing out of the climates over the course of time to allow life to better vary and flourish. That does not take into account, outside forces such as an asteroid hit of course.

Unlike Mars, with it's two diminuative moons, that exert little to no control, we are very stable. The Earth varies between 22.1 and 24.5 degrees tilt over a 41,000-year period, while Mars can vary by 10's of degrees over the course of 100,000 years. If we were to start wobbling like Mars, then we would certainly see our long term climate change dramatically, with a definite impact of many life forms. That is my take on it, at least.

But I do agree, would be a great thing for us DSO hunters!

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KathyNS (03-28-2012)

12. the sun does not have enough mass to explode, it will become a red giant instead and gradually ejecting its outer layers, eventually leaving behind a dense core known as white dwarf

13. Originally Posted by jimt
Maybe we will get ejected from the suns orbit and get a new star before Sol blows.

Jim
This would be neat if this were to occur. It would almost keep the life on our planet existing a little bit longer. Although it is expected our oceans will dry up within the next 500,000 years as the sun heats up.
After this happens, what will be in store for us if we are still in existance in that time.

Daus also has it right, our sun will not explode and will only expand as it gets older. No supernova for us, either way when our sun decides to go, we won't be around to see it.

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