It’s Election Day in the U.S., and while millions of Americans are heading to the polls, some voters are casting their ballots from a much more unusual location—space. Astronauts aboard the International Space Station (ISS), orbiting Earth at an altitude of around 400 kilometers (250 miles), are still able to participate in the democratic process despite their physical distance from the planet. But space voting isn’t new—astronauts have been voting from orbit since 1997. Here’s how they do it. The history of space votingThe history of space voting starts in 1996 when astronaut John Blaha could…