MarsX: A Novel Mars could hold the key to a continuing future for mankind. If only something would awaken us from our complacency. Fortunately? That something is already here. MarsX is a novel in the Remembered Earth Universe, a collection of short stories, novellas and novels extrapolating humanity's near future. Note: Originally published as the novellas MarsX1, MarsX2, MarsX3. Hard Science Fiction - Old School.