Carl-sagan Quote by Carl Sagan
““One consequence of this train of argument is that, even if civilizations commonly arise on planets throughout the Galaxy, few of them will be both long-lived and nontechnological. Since hazards from asteroids and comets must apply to inhabited planets all over the Galaxy, if there are such, intelligent beings everywhere will have to unify their home worlds politically, leave their planets, and move small nearby worlds around. Their eventual choice, as ours, is spaceflight or extinction.””
About This Quote
Source Book: Cosmos by Carl Sagan, 1980
Civilizations that survive long must either become spacefaring or face extinction due to planetary hazards.
In simple terms: Long‑lived civilizations need spaceflight or die.
Key Takeaway
Invest in space exploration now.
Themes
space
survival
civilization
technology
extinction
Mood
hopeful
serious
Type
philosophical
inspirational
When to use this quote
- planetary defense
- interstellar migration
- long‑term planning
- global cooperation
Key Concepts
Fermi paradox
astrobiology
political unification
Questions to Reflect On
- Can we realistically unite Earth politically for spaceflight?
- What are the biggest barriers to becoming a spacefaring species?
A Different Perspective
Assumes all societies can achieve political unity and technology, which may not hold.
![“[ When a religious couple wrote to Sagan about fulfilled prophecies, he wrote back in May 1996 :] If ‘fulfilled prophecy’ is your criterion, why do you not believe in materialistic science, which has an unparalleled record of fulfilled prophecy? Consider, for example, eclipses.” quote by Carl Sagan](https://sms4smile.com/quotes/img-quotes/875/carl-sagan-160_belief_when-a-religious-couple-wrote-to-sagan-a_25095.jpg)
