---
title: "1 Earth Billion Quotes By Geoffrey Marcy"
description: "1 Earth Billion quotes by Geoffrey Marcy. Plus more from Geoffrey Marcy and more Earth Billion sayings from other authors."
image: "https://sms4smile.com/quotes/i/080/geoffrey-marcy-64559_earth_our-galaxy-is-10-billion-years-old-the-e_55676.jpg"
---

> [Our galaxy is 10 billion years old. The Earth is only 4.5 billion years old. We are a firefly flicker in the great astrobiology of the galaxy.](https://sms4smile.com/quotes/geoffrey-marcy/our-galaxy-is-10-billion-years-old-the-earth-is-only-4-5-billion/)

[Geoffrey Marcy](https://sms4smile.com/quotes/author/geoffrey-marcy/)

[Image](https://sms4smile.com/quotes/i/080/geoffrey-marcy-64559_earth_our-galaxy-is-10-billion-years-old-the-e_55676.jpg)

## More by Geoffrey Marcy

> [Our galaxy is 10 billion years old. The Earth is only 4.5 billion years old. We are a firefly flicker in the great astrobiology…](https://sms4smile.com/quotes/geoffrey-marcy/our-galaxy-is-10-billion-years-old-the-earth-is-only-4-5-billion/)

[Geoffrey Marcy](https://sms4smile.com/quotes/author/geoffrey-marcy/)

> [What fraction of the twinkling lights you see at night have Earths?](https://sms4smile.com/quotes/geoffrey-marcy/what-fraction-of-the-twinkling-lights-you-see-at-night-have-earths/)

[Geoffrey Marcy](https://sms4smile.com/quotes/author/geoffrey-marcy/)

> [In the next century or two, we humans will have planet-finder telescopes that span our solar system with mirrors strewn from here to Jupiter,…](https://sms4smile.com/quotes/geoffrey-marcy/in-the-next-century-or-two-we-humans-will-have-planet-finder/)

[Geoffrey Marcy](https://sms4smile.com/quotes/author/geoffrey-marcy/)

> [I'm at a funny crossroads, personally. I really want to turn my attention away from planet-hunting towards Search for Extra-Terrestrial Intelligence (SETI) program at…](https://sms4smile.com/quotes/geoffrey-marcy/i-m-at-a-funny-crossroads-personally-i-really-want-to-turn-my/)

[Geoffrey Marcy](https://sms4smile.com/quotes/author/geoffrey-marcy/)

> [A major puzzle for which nobody has an answer is this: is there some size at which the planets change their nature from water-rich…](https://sms4smile.com/quotes/geoffrey-marcy/a-major-puzzle-for-which-nobody-has-an-answer-is-this-is-there-some/)

[Geoffrey Marcy](https://sms4smile.com/quotes/author/geoffrey-marcy/)

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