The New Horizons spacecraft reached the dwarf planet Pluto in July 2015.
NASA's twin probes are going where no one has gone before.
Voyager 1 is farther away than any other spacecraft from Earth.
Voyager 2 is the only spacecraft to have visited all four giant outer planets in the solar system.
The rocky planet circling the closest star to the sun got hammered by a superpowerful flare last year, a new study reports. That's a bit of bad news for anyone hoping that the alien world, known as Proxima b, hosts life.