Educação Superior::Ciências Exatas e da Terra::AstronomiaPresents a class of Professor Bailyn that discusses transits, which are events used by astronomers to find new planets. They calculate the amount of light that is obscured when a celestial body moves across the face of the star and thus discover information about both star and planet, such as size, density, radial velocity and more. He also explains the concept of planetary migration and potential problems in the Solar System