Science markets price space launches and missions, discoveries, climate records and the results of major experiments. Each settles on the announcement or data source its rules name. Launch windows move and results take time, so check each market's deadline as carefully as the question itself.
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A price here is a probability: 62¢ means the market puts the outcome at roughly 62%. The guide to paper trading Science markets walks through reading one, taking a side and checking the result. If you came from a real book, there is a shorter version on practising with Polymarket’s odds, and a comparison of the free prediction market simulators if you are still choosing one.
Everything below trades with simulated money. When you want a scoreboard, run a game against your own group over the same Science questions, or browse every market in the catalog.
Every question below is a live market you can trade with simulated money.