New Space Telescopes Could Look Like Giant Beach Balls

June 13, 2019

The effective diameter of the Terahertz Space Telescope, Walker says, would be about 25 meters. To put this in perspective, the James Webb Space Telescope--which is slated to launch in 2021, and will be the most sensitive telescope ever sent to space--has an aperture of about 6.5 meters. The price difference is even more dramatic: Walker estimates the inflatable telescope would cost around $200 million to send to orbit, whereas the James Webb telescope is expected to cost about $10 billion by the time it’s launched.