LOL, aliens don't exist. She's obviously wearing an elaborate costume. He knows people who do that for fun, okay?

About the history, it isn't so much that he'll be able to read her life story. He isn't a mind reader. What he will be able to get is little hints about her life that have left clues on her appearance. Has she traveled recently? Used her hands to work on something? Practiced gymnastics or fencing or martial arts? Learned to paint or draw? He'll know.