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Cosmos

Three young astronomers are baffled once the newest team member discovers radio signals of a seemingly impossible origin on 1420.163 MHz, in the water hole. After an unexplained power surge deletes crucial recordings, the team members unite and discover that the radio signals resolve to a response to the Arecibo message, a message beamed into space via radio waves in 1974, broadcast by a spacecraft in low Earth orbit using a cloaking system that renders the craft invisible on the visual spectrum but visible in infrared. After the team race to a local radio telescope array to get a new battery when a low battery threatens to halt their investigation, it turns out that the team were the first to receive and identify the message. At the finale, SETI coordinates a global message to be beamed to the craft: "Welcome to Earth", at which point the craft decloaks.