query: What is the second book in the Mars trilogy?
passage: Mars trilogy
The three novels are Red Mars (1992), Green Mars (1993), and Blue Mars (1996). The Martians (1999) is a collection of short stories set in the same fictional universe. The main trilogy won a number of prestigious awards. Icehenge (1984), Robinson's first novel about Mars, is not set in this universe but deals with similar themes and plot elements. The trilogy shares some similarities with Robinson's more recent novel 2312 (2012), for instance, the terraforming of Mars and the extreme longevity of the characters in both novels.
passage: Heritage Trilogy
Heritage Trilogy is a series of military science fiction books written by Ian Douglas that focus on the United States Marine Corps. It is followed by the "Legacy Trilogy" and the "Inheritance Trilogy".The events of the "Heritage Trilogy" span from 2040 to 2067. In "Semper Mars", evidence of an alien civilization that may have intervened in human evolution threatens to throw the Earth into chaos and war when discovered by scientists in the subterranean ruins on Mars. The Marine Mars Expeditionary Force, a 30-man weapons platoon, has been dispatched from the United States Marine Corps to Mars to protect American civilians and interests with lethal force if necessary. The discoveries on Mars, however, start a global war. The United States and its allies fight against most of the member nations of United Nations.