Trump wants a mission to Mars in 7 years — which might be impossible

President Trump today called American astronauts on the International Space Station — and told them he wants humans on Mars by his second term “at worst.” For the most part, the call was amiable and optimistic, with Trump praising the astronauts — Peggy Whitson and Jack Fischer — for their accomplishments. But there was an odd moment during the discussion of Mars, where the astronauts had to explain President Trump’s own bill to him: Trump: Tell me &hell