Exoplanets are worlds orbiting distant stars. Astronomer Néstor Espinoza of Space Telescope Science Institute spoke with EarthSky’s Deborah Byrd on Monday, May 20, 2024, about this diversity of worlds beyond our sun and planets. He talked about the nearby, fascinating TRAPPIST-1 system, located some 40 light-years away. He talked about Proxima Centauri b, the closest exoplanet at 4 light-years. And he touched on some current and future exoplanet missions.