Because Earth rotates toward the East.
The sun stays in its position at the center of our solar system. It doesn’t rise and set. But it appears to rise and set because of the Earth’s rotation on its axis. It makes one complete turn every 24 hours. It turns toward the east. That’s why the Sun, Moon, planets, and stars all rise in the east and make their way westward across the sky.
Because the universe is still expanding, the distant stars and galaxies are getting farther away all the time.
- The universe was born about 13.8 billion years ago in a fantastic explosion called the Big Bang. It began at a single point and has been expanding ever since.
- If the universe were infinitely old as well as infinitely large, it would not contain enough fuel to keep the stars shining forever and to fill up all of space with starlight. And so the night sky is dark.
- In astrophysics and physical cosmology, Olbers’ paradox, named after the German astronomer Heinrich Wilhelm Olbers (1758–1840) and also called the “dark night sky paradox”, is the argument that the darkness of the night sky conflicts with the assumption of an infinite and eternal static universe.
13.8 billion years
The Universe is vast bubble of space and time, expanding in volume
Moon’s Gravity pulling on you.