dark energy

noun

: a hypothetical form of energy that produces a force that opposes gravity and is thought to be the cause of the accelerating expansion of the universe

Examples of dark energy in a Sentence

Recent Examples on the Web

Scientists plan to use the imager to take fast snapshots of the cosmos, study dark energy, and map the distribution of matter throughout the universe. — Josh Dinner, Space.com, 16 Sep. 2026

Once there, Roman will study some of the biggest mysteries in astronomy, from dark energy to the formation of galaxies. — Thomas Fauchez, The Conversation, 14 Sep. 2026

Its survey will produce huge amounts of data and could solve several cosmic mysteries, with potential achievements ranging from understanding dark energy to detecting exoplanets—and finding some things astronomers don’t even know about yet. — Mary Randolph, Scientific American, 1 Sep. 2026

Cosmologists are eager to learn more about dark energy, an unseen force that, according to the Standard Model of the Universe, makes up about 70 percent of the cosmos and is responsible for accelerating the Universe’s expansion. — Stephen Clark, ArsTechnica, 31 Aug. 2026

Word History

First Known Use

1998, in the meaning defined above

Rhymes for dark energy

• bioenergy