On the hunt for other solar systems, scientists have discovered an Earth-sized planet orbiting the star nearest to our Sun, Proxima Centauri. It's an important test of whether we are alone in the universe. Stephen Hawking and others are calling for a mission to search for extraterrestrial life. NASA and private companies are studying what it will take to make our first interstellar space flight.
Journey to the Pale Red Dot
The search for planets beyond our solar system has brought an historic discovery: a planet slightly larger than Earth orbiting a star called Proxima Centauri. At just over 40 trillion kilometers from the Sun, Proxima Centauri is our closest stellar neighbor. Does its planet have a climate, or even life?
