NASA’s Perseverance rover has quietly logged two of the more remarkable milestones of its mission on Mars within the span of a few weeks. In June 2026 it rolled past the distance of a full marathon across the floor and rim of Jezero Crater, and in early July its cameras captured Earth shrinking to a single point of light and then slipping behind Phobos, the larger of the planet’s two small moons.
Taken together, the two events say something about how far the rover has traveled and how strange the view has become from where it now sits. One is a measure of endurance across the Martian surface. The other is a piece of celestial choreography that had never been recorded from the ground of another world.
A marathon in five years and four months
Perseverance crossed the 26.2-mile (42.195-kilometer) marathon threshold in mid-June 2026, on the 1,890th Martian day, or sol, of its mission — a pace that took it a little over five years to reach. The previous rover record-holder, Opportunity, needed 11 years and two months to cover the same ground, a contrast that reflects both a faster vehicle and a more direct route. NASA marked the achievement with an image showing the rover as a faint speck trailed by its own tracks in an area west of Jezero Crater that the science team calls “Arbot,” captured from orbit and released through the agency’s photojournal.
How an orbiter photographed a rover from space
The marathon image was not taken by the rover but by a spacecraft circling overhead. NASA’s Mars Reconnaissance Orbiter used its high-resolution HiRISE camera to spot Perseverance on the surface a day before it hit the milestone, resolving the vehicle as a small greenish dot against reddish ground with its wheel tracks stitching across the terrain. That kind of orbit-to-surface portrait, later highlighted as a featured astronomy image, depends on knowing exactly where the rover is and timing the overflight so the camera passes almost directly above.
Earth reduced to a single pixel behind Phobos
The second milestone came from the rover looking outward rather than an orbiter looking down. On July 2, at roughly 7 p.m. local solar time, Perseverance used its Mastcam-Z instrument to watch Earth drift across the evening sky and disappear behind Phobos — the first time humanity has recorded Earth being blocked by another object as seen from the surface of a different planet, according to NASA’s Jet Propulsion Laboratory. In the composite sequence, Earth moves diagonally in one direction while Phobos crosses in the other, until the two line up and the planet slips behind the moon’s shadowed edge.
The distances involved explain why Earth registered as barely more than a dot. Phobos is a lumpy, potato-shaped body about 17 miles (27 kilometers) across at its widest, orbiting only about 4,850 miles (7,800 kilometers) above Mars, which made it appear roughly a third as wide as the full Moon looks from Earth. Earth itself was about 195 million miles (314 million kilometers) away at the time, far enough that the entire planet occupied only a single pixel in the image. Catching the alignment took planning: Phobos crosses the Martian sky three times a day and Earth is visible for months on end, but lining one up directly behind the other required deliberate timing.
Why scientists call it an occultation, not an eclipse
The event is technically an occultation — the term for when a nearer object that appears larger completely hides a more distant one behind it. That is distinct from an eclipse, in which one body passes into the shadow of another, and from a transit, in which a smaller-looking object crosses the face of a larger one. Perseverance has recorded transits as well, including moments when Phobos or the smaller moon Deimos passes in front of the Sun, events sometimes loosely described as Martian solar eclipses. The occultation of Earth belongs to a rarer category because it required a specific line of sight linking the rover, a fast-moving moon and a planet nearly 200 million miles distant.
What the two milestones show about the mission
Both achievements are byproducts of a mission built for something else entirely. Perseverance’s core job is to collect and cache rock samples from Jezero Crater, a dried lakebed where ancient water once pooled, for potential return to Earth, and the driving that added up to a marathon is the accumulation of that scientific traverse rather than a race. The imaging campaigns that produced the Earth-and-Phobos sequence use the same cameras built to study Martian geology, turned skyward during quiet moments. Details of the rover’s instruments and ongoing work are maintained on NASA’s Mars program pages, which track the traverse as it continues past the marathon mark and deeper into terrain the science team has only begun to explore.
This article was produced with AI assistance and reviewed by the Morning Overview editorial team.
More from Morning Overview
