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Brewer's: Planet-struck

A blighted tree is said to be planet-struck. Epilepsy, paralysis, lunacy, etc., are attributed to the malignant aspects of the planets. Horses are said to be planet-struck when they seem…

Sedna: Planetoid or Planet?

On March 15, 2004, astronomers confirmed the discovery of the most distant object ever identified in our solar system. Twice as far from the Sun as any known object, this red mass has an…

Venus, in astronomy

(Encyclopedia) Venus, in astronomy, 2d planet from the sun; it is often called the evening star or morning star and is brighter than any object in the sky except the sun and the moon. Because its…

Pluto, in astronomy

(Encyclopedia) Pluto, in astronomy, a dwarf planet and the first Kuiper belt, or transneptunian, object (see comet) to be discovered (1930) by astronomers. Pluto has an elliptical orbit usually lying…

A Tenth Planet? Or Just Eight?

—By Borgna Brunner In 2003 the dating of an Ethiopian Homo sapiens fossil, “Herto Man,” was hailed as a milestone in paleoanthropology. At 160,000 years old, Herto Man was a full 50,000 years…

terrestrial planet

(Encyclopedia) terrestrial planet, the earth or a planet that resembles the earth in its physical characteristics. The terrestrial planets in the solar system are the earth, Mercury, Venus, and Mars…

planetary system

(Encyclopedia) planetary system, a star and all the celestial bodies bound to it by gravity, especially planets and their natural satellites. Until the last decade of the 20th cent., the only…

Shasta, Mount

(Encyclopedia) Shasta, MountShasta, Mountshăsˈtə [key], volcanic peak, 14,162 ft (4,317 m) high, N Calif., in the Cascade Range. Visited c.1827 by Peter Skene Ogden, a British fur trader and explorer…