In astronomy, astrophysics and geophysics, a mass concentration is a region of a planet's or moon's crust that contains a large positive gravity anomaly. In general, the word "mascon" can be used as a
Topography (top) and corresponding gravity (bottom) signal of Mare Smythii on the Moon containing a significant mascon
Mascons at Caloris Planitia and Sobkou Planitia
Lunar orbit
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In astronomy and spaceflight, a lunar orbit is an orbit by an object around Earth's Moon. In general these orbits are not circular. When farthest from the Moon a spacecraft is said to be at apolune, a
Orion capsule of Artemis 1 above the Moon in December 2022.
Lunar Module Eagle in lunar orbit during Apollo 11, July 1969
First image of Earth from around another astronomical object (the Moon), and first picture of both Earth and the Moon from space, by Lunar Orbiter 1 (not to be confused with the later Earthrise image).