The only working telescope at a Lagrange point is Gaia [0] at Earth-Sun L2, but it is an astrometry instrument, designed to measure the position and brightness

The only working telescope at a Lagrange point is Gaia [0] at Earth-Sun L2, but it is an astrometry instrument, designed to measure the position and brightness of various stars, rather than generic deep-space imaging. The Herschel Space Observatory [1] is also at the Earth-Sun L2 point, and has a 3.5m IR telescope, but ran out of coolant in 2013 and is now defunct. Interestingly, these are both ESA missions, not NASA. 0. https://en.wikipedia.org/wiki/Gaia_(spacecraft) https://en.wikipedia.org/wiki/Gaia_(spacecraft) 1. https://en.wikipedia.org/wiki/Herschel_Space_Observatory https://en.wikipedia.org/wiki/Herschel_Space_Observatory