Gigantic Space Telescope's Main Mirror Now Complete

Well, this is pretty cool news: The main mirror for the James Webb Space Telescope is now fully assembled! OK, first, JWST is the successor* to Hubble, an observatory optimized for viewing the Universe in infrared wavelengths, outside what our human eyes can see. This will make JWST very sensitive to distant galaxies, low-mass stars, planets orbiting other stars, and about a zillion other very interesting astronomical objects. And second, JWST's mirror isn't like other telescope's, where you hav...