Donald Trump would like to see Americans walk on Mars during his presidency – within three to seven years, depending on the whims of the voting public. Nasa would love to get there that quickly, too. The reality of space travel is slightly more complicated.
On Monday, during a call with astronaut Peggy Whitson, who was aboard the International Space Station, Trump pressed her for a timeline on a crewed mission to Mars, one of Nasa’s longest standing and most daunting goals. More >>
