But how do astronauts vote?
According to NASA, the astronauts, living and working aboard the International space station are sent with a few absentee ballots.
The form which is sent to the astronauts in space is similar to what is also given to military members and their families to fill out while serving outside of the U.S.
'By completing it ahead of their launch, space station crew members signal their intent to participate in an election from space," NASA said.