galactic plane hâmon-e kahkešân Fr.: plan galactique The plane in which the → disk of a → spiral galaxy, such as our → Milky Way, lies. |
supergalactic plane hâmon-e abarkahkašâni Fr.: plan supergalactique The symmetry plane of the → Local Supercluster, where density of galaxies in our environment is the largest. The plane passes through the → Virgo cluster of galaxies, about which many of the brightest galaxies in the sky are concentrated. The supergalactic plane was recognized by Gérard de Vaucouleurs (1918-1995) in 1953 from the → Shapley-Ames catalogue. → supergalactic; → plane. |