The European Extremely Large Telescope (E-ELT) will be the world's largest optical and infra-red telescope, pointed towards space to advance the search for new planets and even new life. It's also going to sit on the newly flattened top of Chile's Cerro Armazones, a 3,000-meter (9,800-foot) mountain that's going to be 18 meters shorter later this afternoon. Which means that after the stream starts at 12:30pm ET, you get to watch the top of a mountain explode, for science. Have fun.