In theory, how would you change a planet's orbit?

Suppose I wanted to move a planet like Mars closer to the Sun to raise its temperature and aid in terra-forming it with an eye to future colonization.
I suspect I'd have to change the orbit, and I wonder what practical methods, including speculative power sources might be used?

2009-12-01T22:34:59Z

I appreciate the efforts thus far, but:
I suspect there is no God, and I'm looking for practical answers.
I appreciate the possibility of intersecting orbits, so let me specify this must be done safely.
I'd prefer to do this without damaging Mars.
As to "Why?", I specified that in my question.
I know the Sun's gravity is strong, so I'm looking for something stronger.
Thanks.

Bigbang2009-12-01T21:49:28Z

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that is too risky,if it goes a bit wrong we might end up with mars' orbit intersecting earth's.
Furthermore we haven't developed enough technology for those things yet

Akas2009-12-01T22:19:57Z

That would be impossible because the sun's gravity won't allow that to happen because of it's strenght and even if we were able to do it why would we I mean there should be a reason to move Mars out of its orbit. Moving Mars out of it's orbit might colide with our orbit causing destruction and the end of Earth an Mars.
Thanks

Knobbie2009-12-01T21:49:21Z

In Colossians 1:17 it says: (talking about Jesus Christ)
And He is before all things, and in Him all things hold together.
Don't bother trying to change the orbit - it can't be done.
If God wants to change it, He will.

Ashley Jeanne2009-12-01T21:54:09Z

Well you could crash a moon sized body into it. Or there's always the Hand of God.