Most people know that an astronomer is someone who studies space (there are a few people who, no matter how many times you explain the difference to them, will confuse an astronomy with astrology). Most people don't know, however, what an astronomer does.
Moiya McTier got tired of people asking her if she wants to be an astronaut or what her favorite telescope is. Her boyfriend, Will, realized that if she already spends a lot of time explaining how she does science to him, she might as well kill two birds with one stone and make a podcast out of it. And thus So You Think You Can Science was born.