Comment on Time travel doesn't work unless you also have teleportation. If you travel to the past/future, Earth will be in a different position in its orbit, and you'll die in space.
The microwave background is like a rainbow. When you move, it appears to move. You’re always at the “center” of it.
You can measure the Doppler shift relative to the cosmic microwave background though
fubbernuckin@lemmy.dbzer0.com 4 days ago
You can measure the Doppler shift relative to the cosmic microwave background though