The Biggest Optical Telescope Ever

This time we feature a project to build a telescope with a 30-meter mirror. It's called the Thirty-Meter Telescope (TMT) and is being developed by a consortium of five nations, including Japan. Such a large telescope would be impossible without technology to make ultra-high-precision mirrors, and adaptive optics that boost the image resolution even further. We'll meet Japanese scientists and engineers involved in overcoming these daunting technical challenges.