Photograph by NASA

Mars once was wet and fertile. It’s now bone dry. Something bad happened…[and] I want to know what [it was]…so that we may prevent it from happening here on Earth.

Neil deGrasse Tyson — American Astrophysicist, Author, Science Communicator, and since 1996 Director of the Hayden Planetarium at the Rose Center for Earth and Space, New York City (Born 1958).