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The superior planets, orbiting outside the Earth's orbit, do not exhibit a full range of phases since their maximum phase angles are smaller than 90°. Mars often appears significantly gibbous, it has a maximum phase angle of 45°. Jupiter has a maximum phase angle of 11.1° and Saturn of 6°, [1] so their phases are almost always full.
"Inferior planet" refers to Mercury and Venus, which are closer to the Sun than Earth is. "Superior planet" refers to Mars, Jupiter, Saturn, Uranus, and Neptune (the latter two added later), which are further from the Sun than Earth is. The terms are sometimes used more generally; for example, Earth is an inferior planet relative to Mars.
Broderick David Allan (born 1995) is a finalist in the 2008 Society for Science and the Public middle school science competition, for his engineering project. He attends the Saginaw Arts and Sciences Academy, Saginaw, Michigan: JPL · 25125: 25127 Laurentbrunetto: 1998 SZ: Laurent Brunetto (born 1972), a physics professor in Antibes, France ...
The definition of a planet has been a hot topic ever since a change kicked Pluto out of our planetary lineup in 2006. Now, a group of researchers is proposing a new definition yet again—one with ...
With the development of space travel, as well as in hypothetical observations from other points in space, 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 of an object and its appearance as a "phase" is the function of the phase angle.
Visual conjunction between the Moon and the planet Venus, the two brightest objects in the night sky. In astronomy, a conjunction occurs when two astronomical objects or spacecraft appear to be close to each other in the sky. This means they have either the same right ascension or the same ecliptic longitude, usually as observed from Earth. [1] [2]
Diagram showing the eastern and western quadratures of a superior planet like Mars. In spherical astronomy, quadrature is the configuration of a celestial object in which its elongation is a right angle (90 degrees), i.e., the direction of the object as viewed from Earth is perpendicular to the position of the Sun relative to Earth.
Wu Qijin (born 1992) was awarded second place in the 2010 Intel International Science and Engineering Fair for her animal-sciences project. She attends the Fuzhou No. 1 Middle School, Fuzhou, Fujian, China: JPL · 26323: 26328 Litomyšl: 1998 WQ: Litomyšl, a medieval town located in eastern Bohemia, Czech Republic. This traditional cultural ...