After Math: Fly me to the Moon (and then on to Mars)

This was a stellar week for space exploration. Elon Musk showed off a new rocket and announced plans to colonize Mars by 2022. Lockheed Martin showed of its prototype all-in-one rocket-spacecraft design. And the US and Russia agreed to go live on the moon together -- because science, of course. Numbers because how else are you going to calculate gravitational exit velocity?