Most of us on earth only get to see space through the pictures spacecrafts take up there. How exactly do those pictures get back to earth? Since the beginning of space flight, when the Soviet Union first put Sputnik into orbit, we've needed a way to send and receive data between Earth and whatever we've just flung off Earth.
Surprisingly, as Amy Shira Teitel explains in today's DNews special, we've used the same basic technology since day one – and that's why we can't get a live video stream from Mars. Yet.