CAPE CANAVERAL, July 20 — The abandoned upper stage of the Falcon 9 rocket that launched the DSCOVR climate observatory in 2015 has crashed into the Moon, ending a seven-year drift through an unstable Earth orbit. The stage was never intended to hit our nearest neighbour, but the same gravitational mechanics that make lunar missions possible also dictated this final, unguided impact.
The stage was the Falcon 9’s second stage, the part that delivered DSCOVR — the Deep Space Climate Observatory, a joint mission between the National Oceanic and Atmospheric Administration and NASA — to its transfer orbit on February 11, 2015, from Cape Canaveral Air Force Station in Florida. DSCOVR’s destination is the Sun-Earth Lagrange Point 1, about 1.5 million kilometers from Earth, where it observes solar wind and monitors Earth’s climate.
The technical reality of the launch, however, was that after the stage finished its job, no controlled deorbit burn was performed. It simply had insufficient fuel left to return to Earth. Left in a highly elliptical Earth orbit with an apogee near the Moon’s orbit, the stage then spent seven years drifting.
Gravitational perturbations from the Sun, Earth and Moon — plus minor nudges from solar radiation pressure — gradually decayed that orbit. By early 2022, calculations showed it would intersect the Moon.
The stage had been tracked by NASA’s Jet Propulsion Laboratory and amateur observers using data from the Minor Planet Center. The detail that matters is that the mission was originally intended to leave the stage in a heliocentric orbit, but engineering choices left it in an unstable Earth orbit instead.
Gravity’s Tail
Space debris’s final resting place, it turns out, is not always the ocean. The same gravitational dynamics that enable lunar missions — the careful choreography of the Earth-Moon-Sun system — can also cause abandoned hardware to crash into the Moon. This is not a rare occurrence; several upper stages and spacecraft have met similar fates.
What makes this particular case notable is that the stage was never meant to be anywhere near the Moon after its primary mission. It was simply left in a parking orbit that proved not to be a parking orbit at all.
The impact itself was not observed directly, at least not by any human instrument — no spacecraft was in position to photograph the crash. The stage’s trajectory was well enough known, however, that the strike was considered a certainty weeks in advance. By July 2022, the event is now history.
The Moon now has one more small crater, a few metres across at most, marking the spot where a piece of launch hardware finally came to rest.
What Comes Next
The DSCOVR satellite itself remains healthy at L1, continuing its dual mission of watching the Sun’s wind and the Earth’s climate. The stage that carried it there is rubble on the lunar surface. The episode serves as a reminder that abandoned hardware in high Earth orbit does not simply sit still; it drifts, perturbed by every body in the neighbourhood.
Future mission planners will take note: a heliocentric disposal is not just tidy, it is necessary. Otherwise, the Moon will continue to collect the debris of space programmes, one unguided stage at a time.
