  The Origins Space Telescope (OST) will transform our understanding of the
Universe, from formation of the earliest galaxies to the creation of habitable
worlds. OST's Mission Concept 1, the subject of this report, features a cold (4
K) large-aperture telescope (9.1 m) and five powerful instruments, providing
imaging and spectroscopy over a wavelength range from 5 to 660 microns. OST's
dramatic increase in sensitivity over previous missions ensures breakthrough
discoveries in a broad range of astrophysics disciplines.
