What Spacecraft Will Enter Interstellar Space Next?
In December 2018, NASA's Voyager 2 spacecraft reached interstellar space, following the example of its sister, Voyager 1. Right now, only five spacecraft have been launched capable of making such a grand exit, including the Voyagers. The remaining three are Pioneers 10 and 11, and New Horizons. Which one will be the next to make a great escape?