Do you follow Chris Hadfield on Twitter? If not, you totally should. Commander Hadfield is a Canadian astronaut living in space, onboard the International Space Station, and he’s very active on Twitter. He shares breathtaking photos of Earth (like the one he posted last night, above, of the full moon over the Earth’s atmosphere), and interacts with other people. If you tweet to him, odds are, he’ll tweet you back! Technology is so amazing.