Five Unsolved Space Mysteries

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3. What Is Dark Energy?

What Is Dark Energy?

Dark energy is an unknown form of energy that affects the universe on the largest scales. The first observational evidence for its existence came from measurements of supernovas, which showed that the universe does not expand at a constant rate; rather, the universe’s expansion is accelerating. The nature of dark energy is more hypothetical than that of dark matter, and many things about it remain in the realm of speculation.

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