Proxima Centauri: The Closest Star to our Sun. Proxima Centauri, the nearest member of the Alpha Centauri triple star system. Light takes only years to reach us from Proxima Centauri. This small red star is in the center of the above image.
--- Credit: Chris Hadfield ( / Canadian Space Agency Earth Day is even celebrated in space. Canadian astronaut Chris Hadfield sent down some well wishes from the International Space Station today (April in honor of Earth Day