answer these big questions are described and prioritized, where appropriate. Similar decadal surveys cover astronomy and astrophysics, earth science, and heliophysics.

As of 2022 there have been three "Decadals", one published in April 2002 for the decade from 2003 to 2013, one published on March 7, 2011 for the decade from 2013 to 2022, and one published on April 19, 2022 for the decade from 2023 to 2032.

Before the decadal surveys

* Planetary

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