Extraterrestrial

Definition and stakes

Outer Space Treaty of 1967 (1967)

“ States Parties to the Treaty shall pursue studies of outer space, including the Moon and other celestial bodies, and conduct exploration of them so as to avoid their harmful contamination and also adverse changes in the environment of the Earth resulting from the introduction of extraterrestrial matter and, where necessary, shall adopt appropriate measures for this purpose. ”
Source: Wikisource

| override_editor,  Advanced Automation for Space Missions… (1980)

“ Figure 5.27 - Population of extraterrestrial civilizations as a function of galactic time. If we do in fact find such machines and are able to interrogate them successfully, we may become privy to the doings of incredibly old alien societies long since perished. These societies may lead to many others, so we may be treated, not just to a marvelous description of the entire biology and history of a single intelligent race, but also to an encyclopedic travelogue describing thousands or millions of other extraterrestrial civilizations known to the creators of the probe we are examining. ”
Source: Wikisource

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