Space Program

William Potter effectively argues for a long-term program of Earth observations from space (“Mars Is Nice to Visit, but Take a Look at Earth,” Op-Ed Page, Jan. 29). “Mission to Planet Earth” obviously should be supported by the U.S. space program, but there is no necessity to make it an alternative to the proposed American-Soviet human exploration of Mars, as did Dr. Potter.

They are two different things: One is a relatively inexpensive, robotic series of space observations, responding to an urgent global problem. The second is a proposal to involve the high technology and creative development of the industry and science of the superpowers in responseto an evocative human calling: exploration of other worlds. Comparing two programs isn’t valid--politically, economically or technically.

As Potter notes, we can “turn our attention from space to Earth.” But a policy of looking inward is hardly a rejuvenation of peaceful civilian space exploration, nor is it an optimistic expression about the role of the United States in the 21st Century. The Planetary Society is urging the goal of human Mars exploration and is also advocating international cooperation in “Mission to Planet Earth.” We find no conflict--and, in fact, we find great synergy among the goals. After all, it was American exploration of the planets that taught us about the greenhouse effect and much about ozone depletion.

Let’s move forward on protecting this planet and exploring others.

LOUIS FRIEDMAN

Executive Director

The Planetary Society

Pasadena