NASA scientist: First step to moving off Earth

NASA’s head of planetary science, Jim Green, says the touchdown on the 67P/Churyumov-Gerasimenko comet is evidence the solar system is now in the grasp of wider human exploration:

How audacious! How exciting! The solar system is mankind’s — this mission is the first step to take it. It’s ours… It’s these steps that will lead us beyond this planet and on to Mars and out into the solar system. I truly believe that a single-planet species will not survive long. It’s our destiny to move off this planet.