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Elias

(Encyclopedia)Elias ēlīˈəs [key], Greek form of Elijah. ...

Sophonias

(Encyclopedia)Sophonias sōˌfənīˈəs [key], Greek form of Zephaniah. ...

Constantinople, Latin Empire of

(Encyclopedia)Constantinople, Latin Empire of, 1204–61, feudal empire established in the S Balkan Peninsula and the Greek archipelago by the leaders of the Fourth Crusade (see Crusades) after they had sacked (120...

Macedonia, region, Europe

(Encyclopedia)Macedonia măsˌədōˈnēə [key], region, SE Europe, on the Balkan Peninsula, divided among the countries of Greece, Bulgaria, and North Macedonia. A secret terrorist organization working for Mace...

Tombaugh, Clyde William

(Encyclopedia)Tombaugh, Clyde William tŏmˈbô [key], 1906–97, American astronomer, b. Streator, Ill. Although lacking formal training or a college degree, he was hired in 1929 as an assistant by the Lowell Obse...

Ricci, Matteo

(Encyclopedia)Ricci, Matteo mät-tāˈō rētˈchē [key], 1552–1610, Italian missionary to China. He entered the Society of Jesus, and in Rome he studied under Clavius. Ricci was sent to the Indies (1578), and h...

Roche limit

(Encyclopedia)Roche limit, the closest distance that a celestial body held together only by its own gravity can come to a planet without being pulled apart by the planet's tidal (gravitational) force. This distance...

Omar Khayyam

(Encyclopedia)Omar Khayyam kīämˈ [key], fl. 11th cent., Persian poet and mathematician, b. Nishapur. He was called Khayyam [tentmaker] probably because of his father's occupation. The details of his life are mos...

Hubble Space Telescope

(Encyclopedia)Hubble Space Telescope (HST), the first large optical orbiting observatory. Built from 1978 to 1990 at a cost of $1.5 billion, the HST (named for astronomer E. P. Hubble) was expected to provide the c...

Iapetus, in astronomy

(Encyclopedia)Iapetus īăpˈĭtəs [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn VIII (or S8), Iapetus is 907 mi (1460 km) in diameter, orbits Saturn at a mean...