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Quick question on getting to the moon

Posted by: JamesHughes - Fri Nov 27, 2009 8:59 am
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Quick question on getting to the moon 
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Post Quick question on getting to the moon   Posted on: Fri Nov 27, 2009 8:59 am
The Apollo shots orbited around the earth a few times I believe before transferring to the moon orbit. My question is - do you need to have orbital speed to get to the moon? Can you not (e.g. like armadillo) just fly straight up at a relatively low speed, but keep thrusting, and eventual impact the moon? If you wanted to soft land I guess you would need to match the moon orbital velocity (1.03km/s), but I would think a hard landing would be a good first effort.



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Post Re: Quick question on getting to the moon   Posted on: Fri Nov 27, 2009 11:01 am
You have to gain escape energy. If you do it slowly you encounter huge losses from gravity. The faster you go, the easier it is.

Once you get to a certain point, the Moons gravity becomes the dominant force and you start to fall towards the moon.

If the moon wasn't there, you woul either enter a highly elliptical orbit (probably intercepting the surface of the Earth) or eventually reach the point where escape velocity is very small.

Or something...

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Post Re: Quick question on getting to the moon   Posted on: Sat Nov 28, 2009 10:49 pm
You generally would go around once because it's much easier to target that way. LRO/LCROSS did that. And you need to launch east to take advantage of the boost in speed you get from the earth's rotation.

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