Evolution is biology.
The Big Bang is astrophysics cosmology, and has nothing to do with life or biology.
And evolution has nothing to do with how life first came to be (ie. the origin of life). Evolution deal with changes of life (such as biological diversity) that already existed or existing, due to changing environmental conditions.
If you really want to know about the origin of life in science, then this is abiogenesis, not evolution.
And lastly, evolution is not a study of life (biodiversity) of another planet. There may be life in other planets in other star system, but if there were other lifeforms out there, scientists can only speculate about extraterrestrial biological life.