SETI Institute scientist Jason Rowe returns to tell us about the smallest exoplanet so far that has had its size and mass determined. Jason also talks with Mat about our ever-expanding knowledge of these worlds that circle faraway stars. Emily Lakdawalla and Bill Nye report from the New Horizons control center just hours before the spacecraft has its historic encounter with Pluto. Plutomania continues with Bruce Betts and this week’s What’s Up segment.
Danielle Futselaar, SETI Institute
An artist’s conception of what Kepler 138b, its sister planets and its star might look like.