Anonymous

"Up" is a relative direction based on the point of view of the observer.

Anonymous

The ceiling, what is beyond it before the roof, the roof, the atmospheres, the down part of the universe, as I am in the north continent, and in science, north is down for the universe.

Anonymous

There is no "up", it's all relative. P.S. - Doppler effect. https://en.wikipedia.org/wiki/Doppler_ef...