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When will the longest spaceflight of any one person reach 5 years?
The ISS year long mission set out to explore the health effects of long duration spaceflight. Astronaut Scott Kelly and cosmonaut Mikhail Kornienko spent 342 days in space for this mission, checking their health but they were also keeping a journal to write down how they felt. After all, there are more angles to consider than just physical health for these kind of things.
But this wasn't the first mission of its kind. There were three other, longer spaceflights, lasting 365, 379 and 437 days respectively. So we wonder:
When will longest duration anyone has ever been in space surpass 5 years?
Will resolve when the same person has been continuously in space for 5 years or longer.
Metaculus help: Predicting
Predictions are the heart of Metaculus. Predicting is how you contribute to the wisdom of the crowd, and how you earn points and build up your personal Metaculus track record.
The basics of predicting are very simple: move the slider to best match the likelihood of the outcome, and click predict. You can predict as often as you want, and you're encouraged to change your mind when new information becomes available. With tachyons you'll even be able to go back in time and backdate your prediction to maximize your points.
The displayed score is split into current points and total points. Current points show how much your prediction is worth now, whereas total points show the combined worth of all of your predictions over the lifetime of the question. The scoring details are available on the FAQ.
Note: this question resolved before its original close time. All of your predictions came after the resolution, so you did not gain (or lose) any points for it.
Note: this question resolved before its original close time. You earned points up until the question resolution, but not afterwards.
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Metaculus help: Community Stats
Use the community stats to get a better sense of the community consensus (or lack thereof) for this question. Sometimes people have wildly different ideas about the likely outcomes, and sometimes people are in close agreement. There are even times when the community seems very certain of uncertainty, like when everyone agrees that event is only 50% likely to happen.
When you make a prediction, check the community stats to see where you land. If your prediction is an outlier, might there be something you're overlooking that others have seen? Or do you have special insight that others are lacking? Either way, it might be a good idea to join the discussion in the comments.