urprise this planet was. It is about half the mass of Jupiter but orbits much closer to its star than Mercury orbits the Sun: 0.05 AU versus 0.31 AU. At that time, we knew of two planetary systems: our Solar System and the single-planet star 51 Pegasi. The count now is more than 3,000, and we expect more exoplanets will be confirmed through ongoing analysis and the results of new surveys. 3. Review the steps in this activity and summarize how our knowledge of exoplanets has grown over the last few decades. Include in your summary how we have become confident in what we know about the exoplanets. Be sure to use at least three of the key terms in your explanation