Answer: It is because Our Earth's rotation. Our Earth rotates from Weat to East because of that it seems that sun rises from east and sets in west. Actually Sun rise and Sun set are wrong concepts it's not sun it is our earth which rotates that's why sun seems to rise and set.
n Simple terms ,The Universe is all the matter and energy that was generated/released by the Big Bang. Roughly a bubble with a radius of 13.6 billion light years. Outer space is the part of the Universe that's outside of Earth's atmosphere. Earth is part of theUniverse, but by definition not part of outer space.
Although the two terms space and universe are often interchanged by many people, there is a distinct difference between space and universe. Space typically refers to the void that exists between celestial objects whereas universe refers to all celestial objects as well as space. Thus, the key difference between space and universe is the inclusion of celestial objects.