superior conjunction
21Elongation (astronomy) — (For other uses of elongation, see Elongation) Elongation is an astronomical term that refers to the angle between the Sun and a planet, as viewed from Earth.When an inferior planet is visible after sunset, it is near its greatest eastern… …
22Opposition (astronomy and astrology) — Opposition is a term used in positional astronomy and astrology to indicate when one celestial body is on the opposite side of the sky when viewed from a particular place (usually the Earth). In particular, two planets are in opposition to each… …
23Opposition (planets) — In positional astronomy, two celestial bodies are said to be in opposition when they are on opposite sides of the sky, viewed from a given place (usually the Earth). In particular, two planets are in opposition to each other when their ecliptic… …
24Colonization of Mars — An artist s conception of the colonization of Mars, with a cutaway showing part of the interior The colonization of Mars by humans is the focus of speculation and serious study because the surface conditions and availability of water on Mars make …
25Observations and explorations of Venus — Venus in real color as it would appear to the naked eye. Observations of the planet Venus were first recorded by Babylonian astronomers around 1600 BC and have continued into the present.[dubious – …
26uranology — noun the branch of physics that studies celestial bodies and the universe as a whole • Syn: ↑astronomy • Derivationally related forms: ↑uranologist, ↑astronomic (for: ↑astronomy), ↑astronomical ( …
27Mercury (planet) — Mercury  ☿ …
28Ganymede (moon) — Ganymede Image of Ganymede s anti Jovian hemisphere taken by the Galileo probe. Lighter surfaces, such as in recent impacts, grooved terrain and the whitish north polar cap at upper right, are enriched in water ice. Discovery …
29Occultation — See also: Occult (disambiguation) In this July 1997 still frame captured from video, the bright star Aldebaran has just reappeared on the dark limb of the waning crescent moon in this predawn occultation. An occultation is an event that occurs… …
30alignment — noun 1. an organization of people (or countries) involved in a pact or treaty (Freq. 2) • Syn: ↑alliance, ↑coalition, ↑alinement • Ant: ↑nonalignment • Derivationally related forms: ↑ …
