What happened in the 1970s?
🌌 Astronomy Advance: The discovery of the first black hole, Cygnus X-1 (1971)
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Further Reading
Scientists revisit the 1st black hole they ever discovered and realize ... (space.com)
Cygnus X-1 - Wikipedia (wikipedia.org)
Cygnus X-1: The black hole that started it all - Astronomy Magazine (astronomy.com)
Black holes: Everything you need to know - Space.com (space.com)
First Black Hole Ever Detected is More Massive Than Thought | TTU (ttu.edu)
A brief history of black holes | Astronomy.com (astronomy.com)
Cygnus X-1 Fact Sheet - StarDate's Black Hole Encyclopedia (stardate.org)
Black hole | Definition, Formation, Types, Pictures, & Facts | Britannica (britannica.com)
The discovery of black holes - Astronomy's Space & Beyond Box (spaceandbeyondbox.com)
The first black hole ever discovered is more massive than we thought (technologyreview.com)