(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…
(Encyclopedia) astronomy, branch of science that studies the motions and natures of celestial bodies, such as planets, stars, and galaxies; more generally, the study of matter and energy in the…
(Encyclopedia) ocean, interconnected mass of saltwater covering 70.78% of the surface of the earth, often called the world ocean. It is subdivided into four (or five) major units that are separated…
U.S. Department of State Background Note Index: People History Economy Defense Foreign Relations PEOPLESudan's population is one of the most diverse on the African continent. There are two…
America's Favorite Pastime by Mark Zurlo With millions of fans across the globe, football has become one of the world's most popular sports, and has (arguably) replaced baseball…
U.S. Department of State Background Note Index: People History Economy Foreign Relations U.S.-Haiti Relations PEOPLEAlthough Haiti averages about 302 people per square kilometer, its…
