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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 beyond that of ...

cycle

(Encyclopedia)cycle, in astronomy, period of time required for the recurrence of some celestial event. The length of a cycle may be measured relative to the sun or to the fixed stars (see sidereal time). A frequent...

deer

(Encyclopedia)deer, ruminant mammal of the family Cervidae, found in most parts of the world except Australia. Antlers, solid bony outgrowths of the skull, develop in the males of most species and are shed and rene...

Himalayas

(Encyclopedia)Himalayas hĭmälˈəyəz, hĭməlāˈəz [key] [Sanskrit,=abode of snow], great Asian mountain system, extending c.1,500 mi (2,410 km) E from the Indus River in Pakistan through India, the Tibet regi...

glacial periods

(Encyclopedia)glacial periods, times during which large portions of the earth's surface were covered with thick glacial ice sheets. In the Pleistocene epoch, in the Carboniferous and Permian periods of the Paleozoi...

Karelia

(Encyclopedia)Karelia kərēˈlēə [key], constituent republic (1990 pop. 800,000), 66,409 sq mi (172,300 sq km), NW European Russia, extending from the Finnish border in the west to the White Sea in the east and ...

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 orbit lies between ...

trusteeship, territorial

(Encyclopedia)trusteeship, territorial, system of UN control for territories that were not self-governing. It replaced the mandates of the League of Nations. Provided for under chapters 12 and 13 of the Charter of ...

war crimes

(Encyclopedia)war crimes, in international law, violations of the laws of war (see war, laws of). Those accused have been tried by their own military and civilian courts, by those of their enemy, and by expressly e...

telescope

(Encyclopedia)CE5 Mirror arrangements for a reflecting telescope telescope, traditionally, a system of lenses, mirrors, or both, used to gather light from a distant object and form an image of it. Traditional o...