ESA Herschel Space Observatory

Herschel, not Hubble, now has the largest mirror in space—an 11.5-foot giant (1.5 times as large as Hubble’s) that made it to space last May and opened to the universe for the first time in June. The mirror will work in concert with instruments that detect far-infrared and submillimeter-band light, which is invisible to the human eye, to peer through interstellar dust and take pictures of galaxies up to billions of light-years away.
herschel.esac.esa.int