Demo
    Diagram showing various orbits around Earth, including phasing orbits, lunar flyby, mission orbit, transfer orbit, and the Moon's orbit.
    The Transiting Exoplanet Survey Satellite will soar 376,000 kilometers into space on each orbit (the yellow lines), so that Earth blocks little of the sky when TESS makes its planet-hunting observations during each 13.7-day orbit. For gravitational stability, TESS will orbit on a separate plane from the Earth and moon, passing Earth twice for each time the moon orbits Earth. This way, the moon will pull TESS in one direction for one orbit and in the other direction on the next. This orbit should be so stable that TESS won’t need to fire its thrusters to stay in its proper orbit. TESS will be the first spacecraft inserted into such a 2:1 lunar resonant orbit. Getting there will require a sequence of events. Once TESS is in space, a solid rocket motor will ignite to begin raising its orbit in phases (the green lines). Once the solid rocket motor is released, hydrazine thrusters will position TESS for its slingshot around the moon and onto a transfer orbit (the red line) that will set up a final thruster firing to put TESS in its mission orbit.
    Two technicians in cleanroom suits work on a space telescope with large solar panels in an indoor facility.
    Technicians prepare the Transiting Exoplanet Survey Satellite for transport to Cape Canaveral, Florida, and launch.
    A lab worker in protective clothing adjusts equipment near a lens on a workstation. Blue storage containers labeled
    An optical engineer at MIT Lincoln Laboratory applies room-temperature vulcanizing silicone to a TESS flight lens. A complication with the RTV caused some concern during testing.