What the Daily Planet is
Jerry Siegel and Joe Shuster introduced the canonical Daily Planet name in Action Comics #23 (April 1940). Earlier Superman issues used ‘Daily Star’ for Clark Kent’s newspaper; the rename became canonical from Action Comics #23 forward. The Daily Planet has been a recurring Superman setting across nearly every continuity, with Lois Lane, Jimmy Olsen, Perry White, and the broader Daily Planet staff serving as Superman’s primary supporting cast.
Collector context
Action Comics #23 trades in the high four to low five figures at CGC 9.0 and above. The book is recognized as a Lex Luthor first appearance (in addition to the Daily Planet rename) and as a Golden Age Superman key.