What Knowhere is
Dan Abnett, Andy Lanning, and Paul Pelletier introduced Knowhere in Nova #8 (Vol. 4, January 2008). The location is a port city built inside the severed head of a deceased Celestial, located at the edge of known space. The framing gave the cosmic Marvel storytelling a recurring port-city setting that subsequent Guardians of the Galaxy stories used extensively.
The MCU’s Guardians of the Galaxy (2014) made Knowhere one of the most-recognized cosmic Marvel settings. James Gunn’s framing positioned Knowhere as a mining settlement; subsequent MCU films (Infinity War 2018, Love and Thunder 2022) returned to the location.
Collector context
Nova #8 (Vol. 4) trades modestly. CGC 9.8 is in the low to mid three figures.