(Encyclopedia) marathon race, long-distance foot race deriving its name from Marathon, Greece. According to legend, in 490 b.c., Pheidippides, a runner from Marathon, carried news of victory over the…
(Encyclopedia) SamaraSamarasəmäˈrə [key], formerly Kuybyshev, city (1989 pop. 1,254,000), capital of its region, E central European Russia, on the left bank of the Volga and at the mouth of the…
(Encyclopedia) Greely, Adolphus Washington, 1844–1935, American army officer and arctic explorer, b. Newburyport, Mass. Entering the Union army at 17, he emerged a brevet major of volunteers at the…
(Encyclopedia) Intracoastal Waterway, c.3,000 mi (4,827 km) long, partly natural, partly artificial, providing sheltered passage for commercial and leisure boats along the U.S. Atlantic coast from…
(Encyclopedia) X Prize Foundation, private, nonprofit prize institute est. 1995 by commercial space entrepreneur Peter Diamandis. Based in Santa Monica, Calif., and funded by foundations and private…
(Encyclopedia) air mass, large body of air within the earth's atmosphere in which temperature and humidity, although varying at different heights, remain similar throughout the body at any one height…
WHERE DOES SPACE BEGIN? WHERE IS EARTH IN SPACE? HOW MUCH SPACE IS THERE? WHAT IS A LIGHT-YEAR? WHAT CAN WE SEE WHEN WE LOOK INTO SPACE? JOURNEY INTO SPACE FIND OUT MORE
When you…
