close

  
Filter options:

Freebase Commons Metaweb System Types /type

Object is not asserted on this topic.
Type
Key

Freebase Commons Common /common

  • The Moon is Earth's only natural satellite. Although not the largest natural satellite in the Solar System, it is, among the satellites of major planets, the largest relative to the size of the object it orbits. It is the second-densest satellite among those whose densities are known. The Moon is in synchronous rotation with Earth, always showing the same face with its near side marked by dark volcanic maria that fill between the bright ancient crustal highlands and the prominent impact craters. It is the second-brightest regularly visible celestial object in Earth's sky, as measured by illuminance on the surface of Earth. Although it can appear a very bright white, its surface is actually dark, with a reflectance just slightly higher than that of worn asphalt. Its prominence in the sky and its regular cycle of phases have, since ancient times, made the Moon an important cultural influence on language, calendars, art, and mythology. The Moon's gravitational influence produces the ocean tides and the slight lengthening of the day.

Freebase Commons Astronomy /astronomy

Freebase Commons Media /media_common

Comments

Hide