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space probe

(Encyclopedia)space probe, space vehicle carrying sophisticated instrumentation but no crew, designed to explore various aspects of the solar system (see space exploration). Unlike an artificial satellite, which is...

exobiology

(Encyclopedia)exobiology or astrobiology, search for extraterrestrial life within the solar system and throughout the universe. Philosophical speculation that there might be other worlds similar to ours dates back ...

O'Neill, Eugene (Gladstone)

(Encyclopedia)O'Neill, Eugene (Gladstone), 1888–1953, American dramatist, b. New York City. He is widely acknowledged as America's greatest playwright. Near the end of his life O'Neill renounced his daughter Oo...

parallax

(Encyclopedia)CE5 The trigonometric parallax of a star, expressed by the angle θ, is a measure of its apparent motion against the background of more distant stars as a result of the earth's motions in its orbit...

Buddha

(Encyclopedia)Buddha bo͞oˈdə, bo͝o– [key] [Skt.,=the enlightened One], usual title given to the founder of Buddhism. He is also called the Tathagata [he who has come thus], Bhagavat [the Lord], and Sugata [we...

basalt

(Encyclopedia)basalt bəsôltˈ, băsˈôlt [key], fine-grained rock of volcanic origin, dark gray, dark green, brown, reddish, or black in color. Basalt is an igneous rock, i.e., one that has congealed from a molt...

Annan, Kofi Atta

(Encyclopedia)Annan, Kofi Atta kōˈfē äˈtä ănˈən [key] 1938–2018, Ghanaian diplomat, the seventh secretary-general of the United Nations (1997–2006) and the first person to hold that office who came fro...

Rolling Stones

(Encyclopedia)Rolling Stones, English rock music group that rose to prominence in the mid-1960s and continues to exert great influence. Member...

Uranus , in astronomy

(Encyclopedia)Uranus yo͝orāˈnəs, yo͝orˈə– [key], in astronomy, 7th planet from the sun, at a mean distance of 1.78 billion mi (2.87 billion km), with an orbit lying between those of Saturn and Neptune; its...

radar

(Encyclopedia)radar, system or technique for detecting the position, movement, and nature of a remote object by means of radio waves reflected from its surface. Although most radar units use microwave frequencies, ...