Aside

What is dark energy?

Sure, the Universe is expanding, and that expansion is accelerating. But beyond simply calling the cause “dark energy,” what do we know about it?

“I must choose between despair and Energy —— I choose the latter.” -John Keats

All week long, some of you have been racking your brains to come up with the deepest, most mysterious questions about the Universe to highlight for our Ask Ethan column. We’ve gotten some outstanding questions and suggestions that you’ve sent in, and while it’s a pity I can only choose one, this week’s honor goes to Piyush Gupta, who asks:

[We] have found that dark energy makes up about 70% [of the] energy in the universe. We have evidence of dark energy from multiple observations. It has [a] real effect on the evolution of [the] observable universe. But what is dark energy? Do we have any idea? Do we have any good models for it?

As it turns out, we do have some good ideas, but let’s make sure we’re all on the same page first….

…. Read more at https://medium.com/starts-with-a-bang/ask-ethan-58-what-is-dark-energy-61db04945b3d

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