The War in Heaven, also known as the Sino-American Pan-Solar Conflict or Solar War 1, was an interplanetary, solar-system encompassing conflict between the major spacefaring powers of the 22nd century. The War in Heaven had major, permanent consequences for the geo-political order of the solar system, and its end ushered in a new order of pan-solar cooperation that still holds to this day.

This article is a stub. See Dying Earth epilogue for a detailed description of the War in Heaven.

For the multi-government body formed in the aftermath of the war, see Solar Commerce Organization.