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Every time Carl Sagan said million, billion, trillion, and quadrillion

If Carl Sagan taught us anything about our universe in Cosmos, he taught us how small we are in the grand scheme of things. The universe deals in magnitudes far beyond our comprehension: billions of galaxies, trillions of stars, quadrillions of particles. So many, that one crazy fan compiled all those 'illions into…

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Carl Sagan explains why aliens are not visiting us all the time

If all the reports of UFO sightings are real, then Earth must be the most popular destination in the Universe. Obviously, that's a ridiculous anthropocentric notion, as Dr. Carl Sagan explains in the must-see 1966 CBS documentary UFO: Friend, Foe, or Fantasy hosted by Walter Cronkite. Listen to Sagan at the 51:55 mark.