(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…
THE GALILEAN MOONSJUPITER’S ATMOSPHEREJUPITER’S LIGHTSFIND OUT MOREJupiter is the biggest planet in our Solar System, eleven times bigger in diameter than Earth and two and a half times more…
Source: U.S. Naval Observatory and NASA/Goddard Space Flight Center Anaxagoras, in the 5th century B.C., is credited as the first to figure out the true cause of a lunar eclipse, but his…
Celebrating NASA's birthday with fantastic slideshows featuring astronauts, spacecrafts, moons, planets, and more by Mark Hughes A wake up call came to the American people in 1957, when the…
(Encyclopedia) Juan FernándezJuan Fernándezhwän fārnänˈdās [key], group of small islands, S Pacific, c.400 mi (640 km) W of Valparaiso, Chile. They belong to Chile and are constitutionally a special…
(Encyclopedia) Wouk, HermanWouk, Hermanwōk [key], 1915–2019, American writer, b. New York City. In The Caine Mutiny (1951; Pulitzer Prize), he made the protagonist-antagonist Captain Queeg a popular…
HOW DO WAVES CHANGE COASTAL LANDSCAPES? TIDESFIND OUT MORECoasts are border zones where the land meets the ocean. There is about 312,000 miles (502,000 km) of coastline worldwide. TIDES, waves,…
Source: The United States Coast Guard Our first lighthouses were actually given to us by Nature. Sailors sometimes used landmarks such as glowing volcanoes to guide them. In the Ancient World,…
PILSBURY, Timothy, a Representative from Texas; born in Newburyport, Mass., April 12, 1789; attended the common schools; employed in a store for about two years; became a sailor and during the…
founder of ChicagoBorn: c. 1750Birthplace: St. Marc, Saint-Domingue (present-day Haiti) Du Sable had a French father and an African-born slave mother. He was educated (possibly in France) and may…
