Mind boggling! Voyager 1 and Voyager 2, launched in 1977, are 15 and 12 billion miles, respectively, from Earth. It takes about two days to send them a signal and receive one back. It would take another 400 years for the spacecraft to travel the distance light does in one year. And another 1200 years to reach the distance of the next nearest star besides our sun. And another 21,000 years to reach the distance of the nearest galaxy outside of the Milky Way.