When the first astronauts travel to Mars, they will be travelling for long periods of time with no external time cues. You would predict that the circadian rhythms for these astronauts would

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Without external time cues, the circadian rhythms of the astronauts are likely to become desynchronized from the 24-hour cycle on Earth, which could cause them to drift towards slightly longer cycles. This is known as free-running rhythm, where the internal body clocks adjust to a slightly longer day, usually around 25 hours. Studies have shown that astronauts on the International Space Station have exhibited free-running rhythms, so it is likely that the same will happen on a long-duration mission to Mars.

When the First Astronauts Travel to Mars, They Will Be