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“It now seems quite clear that Earth is not the only inhabited planet. There is evidence that the bulk of the stars in the sky have planetary systems. Recent research concerning the origin of life on Earth suggests that the physical and chemical processes leading to the origin of life occur rapidly in the early history of the majority of planets within our Milky Way galaxy–perhaps as many as a million–are inhabited by technical civilizations in advance of our own. Interstellar space flight is far beyond our present technical capabilities, but there seems to be no fundamental physical objections to preclude, from our own vantage point, the possibility of its development by other civilizations.”

Carl Sagan, Ph.D. (Late Professor of Astronomy and Space Sciences, Cornell University)