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black hole

(Encyclopedia)black hole, in astronomy, celestial object of such extremely intense gravity that it attracts everything near it and in some instances prevents everything, including light, from escaping. The term was...

Black Hole of Calcutta

(Encyclopedia)Black Hole of Calcutta: see Kolkata. ...

Woods Hole

(Encyclopedia)Woods Hole, uninc. village (1990 pop. 1,080) and seaport in the town of Falmouth, Barnstable co., SE Mass., at the southwestern extremity of Cape Cod. It is the departure point for nearby island resor...

Jackson Hole

(Encyclopedia)Jackson Hole, fertile Rocky Mt. valley, c.50 mi (80 km) long and 6 to 8 mi (9.6–12.8 km) wide, NW Wyo., partly in Grand Teton National Park. Jackson Lake, 39 sq mi (101 sq km), a natural lake throug...

Woods Hole Oceanographic Institution

(Encyclopedia)Woods Hole Oceanographic Institution, at Woods Hole, Mass.; est. 1930. In addition to oceanographic research, it conducts important work in meteorology, biology, geology, and geophysics. Its facilitie...

Big Hole National Battlefield

(Encyclopedia)Big Hole National Battlefield: see National Parks and Monuments (table)national parks and monuments (table). ...

black snake

(Encyclopedia)black snake, name for several snakes, not all closely related, that are black in color. In the United States the name is applied chiefly to the black racer and to the black rat snake (Elaphe obsoleta)...

carbon black

(Encyclopedia)carbon black, mixture of partially burned hydrocarbons. Carbon black is produced by partial combustion of natural gas. It is used as a black pigment for inks and paints, and is used in large amounts b...

black market

(Encyclopedia)black market, the selling or buying of commodities at prices above the legal ceiling or beyond the amount allotted to a customer in countries that have placed restrictions on sales and prices. Such tr...

black fly

(Encyclopedia)black fly, name for any of the flies of the family Simuliidae. The black fly is about 1⁄8 in. (3.2 mm) long and has large eyes, short legs, a stout, humped back, broad gauzy wings, and piercing-suck...