NASA's Mars robots are on their own right now — here's why

NASA has temporarily stopped sending commands to its Mars-exploring robots, but there’s nothing to worry about.

We’re currently experiencing a “Mars solar conjunction,” a two-week stretch in which Earth and the Red Planet are situated on opposite sides of the sun. Mars mission teams halt commands during such alignments, which occur roughly every two years, for safety reasons.

“The missions pause because hot, ionized gas expelled from the sun’s corona could potentially corrupt radio signals sent from Earth to NASA’s Mars spacecraft, leading to unexpected behaviors,” agency officials wrote in a conjunction explainer on Friday (Nov. 10). (The corona is the sun’s outer atmosphere, which is far hotter than the star’s surface, for reasons that scientists still don’t fully understand.)

NASA’s Mars fleet, however, won’t be standing down during conjunction. During the event, which runs from Nov. 10 through Nov. 25, all of the robots will continue doing at least some work.

For example, the “Perseverance and Curiosity rovers will monitor changes in surface conditions, weather and radiation as they stay parked,” agency officials wrote in the explainer.

“Although momentarily grounded, the Ingenuity Mars Helicopter will use its color camera to study the movement of sand, which poses an ever-present challenge to Mars missions,” they added.

And NASA’s three active Mars orbiters — Odyssey, the Mars Reconnaissance Orbiter (MRO) and MAVEN (short for “Mars Atmosphere and Volatile Evolution”) — will still eye the planet from above. Odyssey and MRO will continue snapping images, and MAVEN will keep studying how Mars’ atmosphere interacts with solar particles, NASA officials said.


— NASA’s Ingenuity Mars helicopter flies on back-to-back days to prep for ‘solar conjunction’ (video)

— Latest photos from NASA’s Mars Reconnaissance Orbiter

— NASA’s Curiosity Mars rover: The ultimate guide

Most of these robots are old hands at riding out conjunctions. Odyssey arrived at Mars in October 2001, for example, and MRO got there in March 2006.

Curiosity has been exploring Mars’ huge Gale Crater since August 2012, and MAVEN reached Mars orbit in September 2014. Perseverance and Ingenuity are the relative newcomers in the fleet; the robotic duo landed inside the 28-mile-wide (45 kilometers) Jezero Crater in February 2021.


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