plural of act of darkness

(astronomy, cosmology) A linked phenomenon conjectured to explain dark matter and dark energy as different manifestations of the same underlying laws of gravity.

Data that are unanalyzed, inaccessible, or not organised in such a way that they are readily available.

A group of three callous-manipulative personality traits: narcissism, Machiavellianism, and psychopathy.

plural of dark ride

(astrophysics) A possible non-random component of the peculiar velocity of galaxy clusters.

(US politics) Funds used to pay for an election campaign that are not disclosed to voters prior to voting, whether spent on behalf of a candidate running in an election, or to influence voting on a ballot.

(physics) The temperature-dependent current that flows in a photodetector when no light is shining on it.

Absolutely dark or black; as dark as pitch.

(astronomy) A type of nebula that does not emit or reflect (visible) light, and thus obscures light sources behind it.