Project Daedalus: Our 1970s Plan for Interstellar Travel

Many ideas have come and gone, but Project Daedalus was a uniquely ambitious plan from the 1970s that never quite came to be.

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Sources:

http://www.spaceflightinsider.com/space-flight-history/project-orion-nuclear-bomb-rocket/
https://www.airspacemag.com/space/hms-moon-rocket-3143/
https://books.google.com/books/about/Project_Daedalus.html?id=nEXpnAEACAAJ
https://bis-merchandise.com/books/project-daedalus.html
https://www.bis-space.com/what-we-do/projects/project-daedalus
https://qz.com/493594/nasa-created-a-material-that-can-heal-itself-in-seconds-even-from-bullets/
https://www.nasa.gov/centers/marshall/news/news/releases/2017/nasa-contracts-with-bwxt-nuclear-energy-to-advance-nuclear-thermal-propulsion-technology.html
https://www.bloomberg.com/news/articles/2018-02-15/nasa-is-bringing-back-cold-war-era-atomic-rockets-to-get-to-mars
https://blogs.scientificamerican.com/observations/50-years-ago-an-astronomer-discovered-the-first-unambiguous-exoplanet-or-so-he-thought/
https://breakthroughinitiatives.org/initiative/3

Images:

https://commons.wikimedia.org/wiki/File:Daedalus_ship.png
https://en.wikipedia.org/wiki/File:Barnardstar2006.jpg
https://en.wikipedia.org/wiki/File:NASA-project-orion-artist.jpg