Dark concepts in astrophysics

mysterious non-luminous matter (and/or radiation) comprising most of the matter in our observable universe

repulsive property with constant energy density theorized to make up most of the universe’s energy content to account for its observed expansion

hypothesized galaxy consisting mainly of dark matter with no, or very few, stars

possible non-random component of the peculiar velocity of galaxy clusters

hypothetical astronomical object heated by dark-matter annihilation

reconciliation between dark energy and dark matter

theoretical elementary particle

postulated type of radiation that mediates interactions of dark matter

object composed of dark energy that outwardly resembles a black hole

astronomical object described by Newtonian mechanics

period between ca. 370,000 and 1 million years after the Big Bang, when no major light producing entities existed

type of globular star clusters with an unusually high mass for the number of stars within it, populated by objects with significant dark matter components, such as central massive black holes