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Watch Cosmic Journeys Season 1 Episode 21 Online

  • 8.5/10
  • COUNTRIES: United States of America
  • Subtitles: English

Spy satellites first saw these brief but extremely bright flashes of light in the 1960s. For three decades, gamma ray bursts for deep space were one of the persistent mysteries in all of science. It took a revolution in high-energy astronomy to prove that they are the distant birth cries of newborn black holes.