Can someone please put my husband out of his misery? He is driving me mad with his theories!

Time slows down as you go faster and approach the speed of light. If you get to the speed of light, time actually stops. Or at least as we understand it.

Now light travels at 3 x 10^{8} m/s.

My husband has done a "back of the envelope" calculation. According to him: the earth spins at 0.5km/sec, the earth orbits the sun at 33 km/s. Our solar system orbits around the Milky Way at 250km/s. Our Milky Way moves in the local group of galaxies at 300km/s. So he has added up the numbers and he has surmised that if everything adds up, in other words, all the rotations sum up, the total speed of travel would be 1 125 000km/sec. Which is faster than the speed of light.

So, his questions are: are his calculations correct? If so, should time have stopped, at least when/if all rotations line up? We should be able to look out and see other galaxies speed up their time, is this possible? And finally, he has heard that it takes an infinite amount of energy to travel at the speed of light, so it should be impossible?

Please help. Its a Sunday night and I really don't want to be talking about this stuff!!!