From its earliest days until the advent of the Space Shuttle, NASA employed a system of single use spacecraft to reach Low Earth Orbit and the lunar surface. Only one craft, the reconditioned Gemini 2, would ever make a second (sub orbital flight) in support of the Air Force Manned Orbiting Laboratory (MOL) program. Those returning from Low Earth Orbit, or the moon used an ablative system to re-enter the Earth’s atmosphere, the effect of friction heating so severe that they would never fly again.
For the venerable Lunar Module, the revolutionary craft, flown so successfully on Apollo 9 and subsequent flights which would land on the lunar surface and return its crew to the orbiting Apollo Command Module; a different fate awaited. The Apollo 9 and 13 craft, lacking any form of heat shield, would burn in the Earth’s atmosphere, the 13 craft doing so after serving as a lifeboat for its crew during the 54 hour return following the crippling failure of an Oxygen tank aboard the service module.
The LM’s of Apollo 11, 12 and 14-17 would leave their descent stages on the surface at their respective landing sites after providing one final service as a launch pad for the ascent stage to return the exploration crew to lunar orbit. Following final separation, the 11 ascent stage would be set adrift in lunar orbit. The remaining ascent stages would, after CSM separation, be commanded to fire their ascent engine in a burn to send them tumbling to a destructive impact on the lunar surface, the resulting impact calibrating the seismometer left on the surface as part of the Apollo Lunar Surface Experiments Package.
Today, the flown spacecraft of Mercury Gemini and flown Apollo Command Modules reside in ground based museums.
The Lunar Module descent stages sit as silent unseen sentinels on the lunar surface. Their presence marking the sites of man’s first tentative steps off the Earth.
Yet the mission of one Apollo craft continues as it charts a seemingly endless 950 Million KM path in heliocentric orbit.
It is a ghostly relic of an era now 50 years in the past, it is the longest flying manned spacecraft by time and distance, yet it carried a manned crew for a mere 12 hours.
For the past 50 years, it has sailed silently through space, its exact position unknown.
May 20 1969, The Apollo 10 Lunar Module, Snoopy, carrying Thomas Stafford and Eugene Cernan, the lunar landscape passing bellow, rides a pillar of fire as it, slowly descends to a high gate point of 14.5 KM from the forbidding lunar surface.
This is the final test. If Apollo 10 is successful, Apollo 11 will, in a matter of weeks, bridge that 14 KM gap to achieve the lunar landing goal set by President Kennedy 8 years earlier. The mission is proceeding beyond expectations, the Command Module, Charlie Brown, Piloted by John Young continues in a 109 KM lunar orbit, as Snoopy sweeps ever closer to the moon. At 102 hours Ground Elapsed Time (GET) the crew prepares to separate from the descent stage and, firing the ascent stage, return to the Command Module. Unlike the LM’s to come, Snoopy’s ascent stage tanks are not fully fuelled, an attempt by NASA to preclude any diversion from the flight plan that may result in an unsanctioned landing attempt.
Prior to separation, in one final action to simulate an emergency procedures for an aborted lunar descent, the crew prior to descent stage separation, configures the ascent stage guidance settings to the Abort Guidance System (AGS) from the customary Primary Guidance and Navigation Control System (PGNS). Inadvertent duplication of switch changes by each of the crew members overloads the LM guidance system and leaves the LM ascent stage gyrating as the LM radar began searching for a non-existent Command Module. For 13 seconds, the lives of two astronauts hang in the balance as the LM, stressed to the limits of its structural integrity, tumbles around the moon. Stafford shuts down the guidance system and takes manual control of the spacecraft, firing the ascent stage to return uneventfully to Charlie Brown with docking at 106 hours 20 minutes GET.
With transfer of Stafford and Cernan to Charlie Brown, Snoopy is separated from Charlie Brown and, under ground control, the ascent engine is again ignited, this time for a 4 minute 9 second burn to depletion. The purpose of this burn was twofold, firstly, to provide an additional test of the ascent engine similar to tests performed on Apollos 5 and 9 and also to clear the orbital space around the moon for Apollo 11. The resultant increase in velocity saw the LM leave lunar orbit for the heliocentric orbit in which it remains to this day.
Within days, its electrical systems would slowly die as its batteries became depleted.
In April 2019, an announcement from the Royal Astronomical Society in London, England brought Snoopy back to public attention with the announcement that, using mathematical computations, an object with the same radar reflection anticipated for an object of Snoopy’s size had been discovered in the right orbit based on initial tracking from 50 years ago.
There are now calls for Elon Musk or another space entrepreneur to develop the technology to recover and return Snoopy to the Earth, or at the very least, to Low Earth Orbit.
The logical question is: why recover a dead obsolete spacecraft? The answer is equally logical. Snoopy is a time capsule, a window to an earlier age of manned spaceflight. We have 3 unflown lunar Modules in inventory on Earth, but they lack the direct connection with an actual mission. If recovered, Snoopy would be the only flown Lunar Module on display and the only manned spacecraft to carry a crew on lunar descent or ascent. This fact alone, makes Snoopy an artefact beyond any conceivable monetary value.
A recovered Snoopy presents a unique archaeological resource. Prior to separation, the crew loaded Snoopy with no longer needed equipment and trash bags. It is, quite literally a space borne time capsule containing relics of the Apollo 10 flight and the early Apollo program. Examination of such relics, and examination of the surfaces of the craft itself, after such a prolonged exposure to the space environment has direct relevance to the development of the craft and resources necessary to reach Mars and, in time the planets beyond the asteroid belt. Snoopy allows an insight into how materials respond to the space environment at varying distances and temperatures over a protracted period.
With its discovery, it is to be hoped that Snoopy will, one day return to the Earth, and in so doing complete the mission it began so long ago. Snoopy, along with the Vanguard 1 satellite represent tangible recoverable artefacts from the earliest days of our journey into space.
They are artefacts from which we can learn for our future, and artefacts which can serve to inspire the next generation of space explorers.
As a museum piece, Snoopy would be without equal, displayed in its current condition in a manner similar to Liberty Bell 7 and the Space Shuttle orbiters, Snoopy tells the story of an unparalleled 50 year mission. For this reason, any post recovery work should be focussed on stabilization and preservation rather than restoration.
With the 50th anniversary of Apollo 10 now upon us, and the rapid development of on orbit retrieval capabilities, it is to be hoped that Snoopy may be soon be reunited with Charlie Brown, restored to the world she left so long ago.