UFO or aliens doesn't esists at all in any universe.
The so called aliens are just Jinns, people see them in different shaps, forms and size, which is acceptable by the humans. Most of people don't know about the Jinns as they don't believe in God or don't follow the religion who defines Jinns, as creatures created by God (Allah).
Jinns are supernatural creatues God created them before Humans, they live longer and have the same lifestyle as humans do.
Some are Muslims, others adopt other religions and don't follow any religion. Some are good and others are bad.