Ed Rivera-Valentin grew up in Arecibo, Puerto Rico, less than 15 minutes away from the jungle home of a 1,000-foot-wide radio telescope. When he was four or five, his parents brought him to the observatory for the first time. He saw the telescope’s mesh dish, resting inside a huge sinkhole in the soft rock formations that shape the region. If he had walked around the Arecibo radio telescope’s dish, he would have clocked more than a mile. The young Rivera-Valentin was awed.