He published two books about the geology of the Moon and of Mars. As head of the Viking surface photography team, he is quoted as commenting on the first pictures: "This is just an incredible scene. It looks safe and very interesting."
A crater on Mars was named in his honor, and the Viking 1 lander was renamed "Thomas A. Mutch Memorial Station" in 1982; the engineering model currently displayed in the Smithsonian Institution has a small plaque beside it commemorating this, and a note that it will be left with the actual lander when circumstances permit. The Thomas "Tim" Mutch Memorial Fund was established in 1981 by his family and friends.