59_214434_SP 16 [7.18.1963]

# Editorial Summary

On July 18, 1963, the National Aeronautics and Space Council circulated an internal memorandum to the Department of State examining the policy implications of potential contact with extraterrestrial intelligence. The document, authored by Maxwell W. Hunter II of the Council's Professional Staff, presents a technical and theoretical assessment of three scenarios: the discovery of indigenous intelligent life on Mars or another solar system body, contact with visitors from distant star systems traveling at sublight speeds, and the remote possibility of contact with an alien civilization possessing faster-than-light travel technology.

The memorandum surveyed the contemporary scientific debate on the likelihood of extraterrestrial life. While the consensus view among scientists held that intelligent life in the solar system was improbable due to environmental conditions on other planets, Hunter noted that prevailing astronomical theory had shifted to suggest that planetary systems are common throughout the galaxy and that life may arise spontaneously. The author examined historical scientific interest in Mars, referencing the "Canali" observations and early-twentieth-century speculation about Martian civilization, while acknowledging that modern scientific confidence in the habitability of other solar planets had diminished even as the statistical likelihood of intelligent life elsewhere in the galaxy appeared to increase.

Hunter analyzed the logistics of interstellar travel from first principles. He calculated that spacecraft from Mars could more feasibly reach Earth's moon than Earth itself, given the energy requirements for escape velocity and atmospheric braking. He further theorized that an expanding interstellar civilization traveling at half to three-quarters the speed of light, establishing colonies at ten-light-year intervals over two hundred thousand years, could theoretically colonize the entire galaxy. He identified three recent astronomical observations that might suggest artificial activity on the moon: hot gases detected from the crater Alphonsus, infrared hot spots, and the limited success of lunar and planetary probes despite efforts by technically advanced nations.

Hunter concluded that while scientific thinking suggested contact with extraterrestrial intelligence was improbable, the possibility merited consideration. He argued that rapid determination of any detected civilization's technological level, specifically whether it relied on chemical propulsion, nuclear-powered travel, or physics beyond Einstein's relativity, would be critical to formulating diplomatic policy. The document remains the only written policy guidance on the subject available in an emergency and is now publicly available as part of the Department of War PURSUE release.