Are we alone in the Universe? Astrophysicist Lisa Kaltenegger on life-friendly exoplanets, nasty aliens and toxic-beautiful sunsets
Lisa Kaltenegger sits in the former office of Carl Sagan, the great US astronomer and well-known presenter. In the virtual background, a section of the universe sparkles with thousands of stars of the Eta Carina nebula, in which stars and with them planets are currently being formed.