A planetary phase is a certain portion of a planet's area that reflects sunlight as viewed from a given vantage point, as well as the period of time during...

The planetary phase of civilization is a term created by the Global Scenario Group (GSG) to describe the contemporary era in which increasing global interdependence...

A planetary nebula is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives...

Look up Phase, phase, or phases in Wiktionary, the free dictionary. Phase or phases may refer to: State of matter, or phase, one of the distinct forms...

Lunar observation – Methods and instruments used to observe the Moon Planetary phase – Part of planet seen to reflect sunlight Planetshine – Illumination...

An epicyclic gear train (also known as a planetary gearset) is a gear reduction assembly consisting of two gears mounted so that the center of one gear...

the notion of phase angle became independent of Sun and Earth. The etymology of the term is related to the notion of planetary phases, since the brightness...

images of Earth from space Lunar phase Overview effect Pale Blue Dot Pale Orange Dot (Early Earth) Planetary phase The Blue Marble The Day the Earth...

A planetary core consists of the innermost layers of a planet. Cores may be entirely solid or entirely liquid, or a mixture of solid and liquid layers...

The Planetary Society is an American internationally-active non-governmental nonprofit organization. It is involved in research, public outreach, and...