The launch of Mars One is predicted by 2025, although the movie Gravity might do for space travel’s popularity what Titanic’s blockbuster year did for cruises.

The race to inhabit space is on, and if you think it’s going to be tough to feed 9 billion people in 2050 here on fertile earth, imagine feeding a colonized planet with no liquid water. Last month, a private corporation delivered cargo, including almost a ton of food, to the International Space Station. The company will charge nearly $2 billion through 2016 for such deliveries. Space is precious in space, and feeding people on Mars would require heaving every necessary morsel of food off earth and hurling it 35 million miles