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For just 72 seconds on the night of August 15, 1977, a radio telescope in rural Ohio picked up one of the most extraordinary signals ever recorded, and it wasn't an ordinary burst of radio noise or a familiar astronomical source. Instead, it was an unusually strong, narrowband signal arriving from the direction of the constellation Sagittarius, close to the 1,420 MHz hydrogen line, a frequency long considered one of the most likely channels an intelligent civilization might use to communicate across interstellar distances.

For years, the idea that Mars once held vast amounts of water has remained one of planetary science's most persistent questions. Dry river valleys, mineral deposits, and ancient lake basins have all hinted that the planet looked very different billions of years ago, but proving the existence of a true ocean has been far more difficult.

In 2010, scientists conducted an experiment to see what happens when people spend nearly a year and a half isolated from the outside world, confined in a spacecraft-like environment with no possibility of leaving. This question was observed in MARS-500, one of the most ambitious space fight stimulations ever conducted.

At the height of the Cold War following World War II, the United States pursued an ambitious and unconventional solution to one of its biggest national security concerns: protecting long-distance military communications from potential Soviet disruption. Thus, to tackle this concern, in 1963, the U.S.