Why is the weather in the universe black and there are morning and evening on the earth?

There are thousands of stars in the universe. It stands to reason that the universe should not be black. The reason why the universe is black is because there are still a lot of dark matter in the universe, which accounts for most of the mass of the universe and blocks the starlight. So the universe is black; There are sooner or later on the earth, because the earth rotates. If our area is facing the sun, that is, day, and the back is night, then there will be morning and evening on the earth.