第5元素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?　　What will it take to get a closer look, to launch our first interstellar journey to the Pale Red Dot?