Thursday, December 15, 2022

How Vast Is the Cosmos, Really?

Life is an accident of space and time. 

There are billions of planets in our galaxy, and billions of galaxies in the observable universe. Those numbers are impossible to picture, but NASA's newest space telescope is helping us see the universe's depths in unprecedented detail. Still, there's one big mystery that humans might never be able to solve: How vast is the cosmos, really, and what does it contain?

If humans were to find evidence of life elsewhere in the universe, it would be a scientific marvel, but also an emotional and spiritual one, the physicist Alan Lightman noted in an essay earlier this fall. Our questions would multiply: "Where did we living things come from? Is there some kind of cosmic community?"

Lightman explains why life in the universe is likely really, really rare. "We living things are a very special arrangement of atoms and molecules," he writes. But these questions aren't just about other planets and galaxies; they're also about us, here on Earth, and why we may want to believe that our lives and our stories are one of a kind. What follows is a reading list on why things are the way they are—from life on Earth down to creepy coincidences at the coffee shop—and how we deal with the unknowable.

This is an edition of The Wonder Reader...

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