crew members switched it, thus returning it to the original position. Had they fired Snoopy in the wrong direction, they might have missed the rendezvous with Charlie Brown or crashed into the Moon at high speed. Once Stafford had regained control of the LM ascent stage, which took about eight seconds, the pair fired the ascent engine at the lowest point of the LM's orbit, mimicking the orbital insertion maneuver after launch from the lunar surface in a later landing mission. Snoopy coasted on that trajectory for about an hour before firing the engine once more to further fine-tune its approach to Charlie Brown. Snoopy successfully rendezvoused with and re-docked with Charlie Brown at 106:22:02, just under eight hours after undocking. The docking was telecast live in color from the CSM. After docking and once Cernan and Stafford had re-entered Charlie Brown, Snoopy was sealed-off and separated from Charlie Brown and Snoopys ascent stage engine was fired to fuel depletion to send the ascent stage on a trajectory past the Moon and into a heliocentric orbit. This maneuver was unlike the fate of the subsequent Apollo 11 ascent stage, which was left in lunar orbit to eventually crash (post-Apollo 11 ascent stages were steered into the Moon to obtain readings from seismometers placed on the surface, except for Apollo 13's ascent stage, which the crew used as a "life boat" to get safely back to Earth before releasing it to burn up in Earth's atmosphere, and Apollo 16's, which NASA lost control of after jettison). Return to Earth Following ejection of the LM ascent stage, the crew slept and performed additional photography and observation of the lunar surface from orbit. Though the crew was able to locate 18 landmarks on the surface and take a number of additional photographs of various surface features, crew fatigue necessitated the cancellation of two scheduled television broadcasts. Thereafter, the main Service Propulsion System engine of the CSM re-ignited for about 2.5 minutes to set Apollo 10 on a trajectory towards Earth, achieving such a trajectory at 137:39:13.7. At the time of its departure from lunar orbit, Apollo 10 had orbited the Moon 31 times over the span of about 61 hours and 37 minutes. During the travel phase back to Earth, the crew performed some observational activities which included star-Earth horizon sightings for navigation. The crew also performed a scheduled test to gauge the