Riding a bicycle from Chicago to St. Louis is a long ways on a bike. But it’s no comparison to the vast distances in the galaxy or universe, distances measured in light years or the distance light travels in a year. Dr. Lucianne Walkowicz is an astronomer with Chicago’s Adler Planetarium and a TED Senior Fellow. She’s also in the middle of a 300 mile bike ride, designed to bring some perspective to the universe.