You searched for: “dark”
Word Entries containing the term: “dark”
dark energy
Any hypothetical form of energy which produces a force that opposes gravity and is thought to be the cause of the accelerating expansion of the universe.
This entry is located in the following unit: New Words (page 1)
dark matter (s) (noun) (no pl)
Matter or substances that are not able to be revealed by its radiation: Dark matter comprises a large portion of the universe. It cannot be seen but can be perceived through its gravitational effects.
This entry is located in the following unit: Astronomy and related astronomical terms (page 8)