NASA operates two rovers on Mars: Curiosity and Perseverance. They follow the Martian day, or “sol,” which is 24 hours and 39 minutes long. This means that the team at NASA’s Jet Propulsion Laboratory in Pasadena has to adjust their schedules to align with Mars time.
For the first 90 sols after a rover lands, the team lives on Martian time. Each morning, their alarms ring later than the day before. This shift quickly gets intense; breakfast might start at midnight within a few weeks. Imagine a family adapting their routines, like David Oh and his family, who ate dinner at 2:30 a.m. They even painted their windows dark to sleep during the day.
The need to follow Mars time stems from how far away the planet is—about 140 million miles. Commands sent from Earth take 4 to 24 minutes to arrive at the rover, meaning the team can’t control the rovers in real-time. Instead, they plan and send commands for each sol in advance, which must be timed with the Martian sunrise.
Adjusting to these long days is hard. Although a sol is longer than an Earth day, our bodies are wired to a 24-hour cycle based on light cues. At JPL, staff reported sleep loss, trouble concentrating, and feeling disconnected from loved ones not on Mars time.
To combat these challenges, JPL collaborated with sleep scientists to devise strategies. They used blue-enriched lighting to help staff stay alert and blackout curtains to create a sleep-friendly environment during the day. Employees used special watches that ticked more slowly to match Mars, and strict caffeine schedules kept energy levels up.
Once the 90 sols are over, the team shifts back to Earth time. They have to readjust their body clocks, which can take about a week. During this time, they may feel like 24 hours is too short, showing just how much they had adapted to their temporary Martian life.
Recent studies indicate that circadian disruptions like this can pose health risks, linking irregular sleep patterns to issues such as metabolic disorders and even increased dementia risk later in life. However, JPL keeps a close eye on staff health, helping them return to normal routines after the mission phase.
Curiosity has been active for over 13 years and has gained more autonomous abilities, meaning that it needs less human oversight, allowing the team to return to a more Earth-friendly schedule. Meanwhile, Perseverance is advancing navigation technology that lets it locate itself more accurately, reducing the need for constant communication with Earth.
The existence of two rovers on different paths—Curiosity exploring younger landscapes and Perseverance uncovering ancient terrains—creates a unique narrative of time and discovery on Mars. As they continue their journeys, the engineers and scientists at JPL live out a peculiar relationship between Earth and Mars, demonstrating human adaptability in the face of the challenges of space exploration.
For further insights into circadian rhythms and their effects on health, you can check research from institutions like the National Institutes of Health.
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