Space.com Planet Hunter: Spitzer Space Telescope TRAPPIST-1 Data Explained 22 February 2017 fborgosano Leave a comment Share: The NASA telescope sights were set on the system for 500 hours (about 21 days) and transits of the planets identified and characterized them. TRAPPIST-1 is 39 light years away and harbors 7 earth-sized planets. from Space.com bit.ly/2mcPvKc Share: