What Do We Know About Alpha Centauri?

Stephen Hawking, Yuri Milner and Mark Zuckerberg helm the board for a new initiative, Breakthrough Starshot, whose technology could be used to someday reach Earth's neighboring star Alpha Centauri after just a 20-year journey. "This is Alpha Centauri, our neighboring star," Milner said in a news conference yesterday (April 12). Alpha Centauri is over 4 light-years away […] that's 25 trillion miles.