Videos

Author and astrophysicist Neil deGrasse Tyson talked about his life and career and responds to viewer phone calls and tweets. Mr. Tyson, the director of the Hayden Planetarium in New York Ci…

Neil DeGrasse Tyson, Michael A. Strauss, and J. Richard Gott talked about their book Welcome to the Universe: An Astrophysical Tour, in which they answer many of the questions of the univers…

Scientists talked about new discoveries resulting from remote exploration of the oceans and space. Among the issues they addressed were what the discoveries taught about earth’s natural hist…