Science fiction novels that explore the concept of humanity becoming a multi-planetary species beyond just colonizing Mars?

I could recommend so many Sci-fi novels that are universal (lol- note the word) where humanity expanded far beyond our solar system. Authored by the “Minds” that were and are Dan Simmons, EE Doc Smith, Issac Asimov, Gregory Benford, David Brin, Alisdair Reynolds, Greg Bear and so many others that I would bore you mentioning them. Instead, I thought to focus on only one (great mind) and introduce you to the enormous and fantastical works of Iain M Banks.

Iain M, created “The Culture” a galaxy spanning civilization that knows no equal, even when outmatched. A considered civilization that depends on minds and abilities, cleverness,