---
title: "2 Planets Doubt Quotes by 2 authors"
description: "Browse 2 Planets Doubt quotes by 2 authors. Discover the best Planets Doubt sayings and thoughts."
image: "https://sms4smile.com/quotes/i/206/frederick-a-babb-17014_intelligence_why-do-we-worry-about-intelligent-life-o_628695.jpg"
---

> [Why do we worry about intelligent life on other planets if we doubt it here on earth?](https://sms4smile.com/quotes/frederick-a-babb/why-do-we-worry-about-intelligent-life-on-other-planets-if-we-doubt/)

[Frederick A Babb](https://sms4smile.com/quotes/author/frederick-a-babb/)

[Image](https://sms4smile.com/quotes/i/206/frederick-a-babb-17014_intelligence_why-do-we-worry-about-intelligent-life-o_628695.jpg)

> [ \[My study of the universe\] leaves little doubt that life has occurred on other planets. I doubt if the human race is the most intelligent form of life. ](https://sms4smile.com/quotes/harold-urey/my-study-of-the-universe-leaves-little-doubt-that-life-has-occurred/)

[Harold Urey](https://sms4smile.com/quotes/author/harold-urey/)

[Image](https://sms4smile.com/quotes/i/892/harold-urey-42546_alien-life_my-study-of-the-universe-leaves-little-d_2736196.jpg)

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