- #1
Quotidian
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- TL;DR Summary
- How does dark energy contribute to, or become measured, as mass?
I have often read that dark matter and dark energy are now thought to comprise 94% of the total mass of the Universe. Just now I was reading an article which says that dark energy comprises 74% of the total. So, I'm confused about how energy can comprise mass. Dark matter, I can understand - even given that its nature is unknown, it's some kind of stuff, so presumably has mass. I also understand that matter and energy are interchangeable via the famous e=mc2 equation. But I'm still hazy on how energy can make up so much of the mass of the Universe.