(Encyclopedia) Local Group, in astronomy, loose cluster of at least 40 nearby galaxies, including our own Milky Way galaxy, the Andromeda Galaxy, and the Magellanic Clouds. The Local Group is spread…
(Encyclopedia) ionosphereionosphereīŏnˈəsfēr [key], series of concentric ionized layers forming part of the upper atmosphere of the earth from around 30 to 50 mi (50 to 80 km) to 250 to 370 mi (400…
(Encyclopedia) drought, abnormally long period of insufficient rainfall. Drought cannot be defined in terms of inches of rainfall or number of days without rain, since it is determined by such…
(Encyclopedia) PentecostPentecostpĕnˈtəkôst [key] [Gr.,=fiftieth], important Jewish and Christian feast. The Jewish feast of Pentecost, in Hebrew Shavuot, the Feast of Weeks, one of the three…
(Encyclopedia) Theodosius II, 401–50, Roman emperor of the East (408–50), son and successor of Arcadius. He preferred the study of theology and astronomy to public affairs, which he left to the…
Born: Feb. 17, 1973Swimming first American woman to win four gold medals in one Olympics (1996); won the individual 50m freestyle, 100m butterfly, and was on the US team for the 4x100 freestyle and…
On Feb. 7, 2016, the Denver Broncos beat the Carolina Panthers, 24-10, in Super Bowl 50. It was Denver's third Super Bowl win in franchise history, having previously won in 1997 and…
