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?
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.