无线电波、大耳朵以及“哇！”讯号
2020 May 2 Radio, The Big Ear, and the Wow! Signal Image Credit & Copyright: Rick Scott Explanation: Since the early days of radio and television we have been freely broadcasting signals into space. For some time now, we have been listening too. A large radio telescope at Ohio State University known as affectionately The Big Ear was one of the first lis...