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Carl Sagan advocated scientifically skeptical inquiry and the scientific method, pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI).

Carl Sagan advocated scientifically skeptical inquiry and the scientific method, pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI).

The $1.3 billion Atacama Large Millimeter/submillimeter Array (ALMA) radio telescope—the largest ever built—will be inaugurated in March, eventually boasting 66 antennas stretching across ten miles. Chajnantor’s dry, thin atmosphere creates ideal conditions for reception of radio waves from outer space. (The antennas, above, are shown against a long-exposure image of the night sky.

The $1.3 billion Atacama Large Millimeter/submillimeter Array (ALMA) radio telescope—the largest ever built—will be inaugurated in March, eventually boasting 66 antennas stretching across ten miles. Chajnantor’s dry, thin atmosphere creates ideal conditions for reception of radio waves from outer space. (The antennas, above, are shown against a long-exposure image of the night sky.

Jodrell Bank radio telescope by Mark Williamson, via Dreamstime

Jodrell Bank radio telescope by Mark Williamson, via Dreamstime

The radio telescope in Medicina, Italy, near to the site where Marconi conducted his first radio experiments.

The radio telescope in Medicina, Italy, near to the site where Marconi conducted his first radio experiments.

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