Character descriptions, Japanese manga covers, and merchandise information.

Kodansha's official English page for the series, with manga information, introduction, characters, and images.

A page about the prequel to MARS, "Namae no nai Uma", with manga information, introduction, characters, and images. From the official English Kodansha site.

Official TokyoPop site for the series with introduction, creator profile, characters, preview, and summaries.