[perennate]

If we somehow manage to "reverse" the Earth's orbit around the sun, does that mean we will have invented a time machine?!

[cmdrfred]

I'd be more impressed with a machine that can decelerate the earth and reverse it's spin direction without killing everyone as opposed to a time machine personally.

[semi-extrinsic]

This isn't exactly HN style, but here ya go...

https://s-media-cache-ak0.pinimg.com/originals/f3/f7/7e/f3f7...