Deep in the forests of Algonquin Provincial Park, a few hours north of Toronto, sits a metal monster. Like the iron giant of British poet Ted Hughes’s fable, it, too, has come back to life, reassembled. Hughes’s creation saves the planet. What’s this one’s mission? Our iron giant is a deep space radio telescope, with an antenna dish measuring forty-six metres across, the largest instrument of its kind in Canada. Starting in the 1960s, the Algonquin Radio Observatory performed a number of cutting-edge scientific projects, including joining SETI’s early efforts, in the 1970s and 1980s, to...