Space entrepreneur Elon Musk this week at the International Astronomical Congress in Guadalajara, as he presented his plan for colonizing Mars. Susana Gonzalez, Bloomberg

Is Humanity Alone in the Universe? How We Deal With Galactic Loneliness

The report of a rare signal received by a Russian satellite may not have brought us any closer to the day when we communicate with intelligent beings from another planet, but it definitely reminds us how little we know about our galaxy and its neighbors

“Where is everybody?” Italian physicist Enrico Fermi asked his friends during lunch.

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