This spring, Canadian astronaut Chris Hadfield became an internet sensation with his cover of David Bowieâs âSpace Oddity.â The video was perfect for YouTube: a real astronaut in a real spaceship, drifting here and there in zero gravity as he strummed a guitar and looked longingly at Earth. It was if the tune, first released in 1969, was made for this moment. âThis is ground control to Major Tom, youâve really made the gradeâŚâ Hadfield became popular on the news form of our times, Twitterâhe almost has a million followers. He will read tonight from his new memoir, An Astronautâs Guide to Life on Earth. (Town Hall, 1119 Eighth Ave, townhallseattle.org, 7:30 pm, $5)