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Gatchina

(Encyclopedia)Gatchina gäˈchēnə [key], city (1989 pop. 80,000), NW European Russia. The city developed around the imperial palace (built 1766–81), which was used as a summer residence by Paul I in the 18th ce...

Dothan, city, United States

(Encyclopedia)Dothan dōˈthən [key], city (2020 pop. 71,072), seat of Houston co., SE Ala., near the Fla....

Woomera

(Encyclopedia)Woomera wo͞oˈmərə [key], village (2016 pop. 146), South Australia, S Australia, near Lake Torrens. It is located within the large Woomera Range Complex, which includes and air force and missile-te...

civil defense

(Encyclopedia)civil defense, nonmilitary activities designed to protect civilians and their property from enemy actions in time of war. A civil defense program usually includes measures taken during peace (e.g., bu...

Vajpayee, Atal Bihari

(Encyclopedia)Vajpayee, Atal Bihari äˈtäl bihärˈē väjˈpīˌ [key], 1926–2018, Indian politician, prime minister of India (1996, 1998–2004). He began his career as a journalist, entering politics as an u...

Chernobyl

(Encyclopedia)Chernobyl chĭrnōˈbyēl [key], Ukr. Chornobyl, abandoned city, N Ukraine, near the Belarus border, on the Pripyat River. Ten miles (16 km) to the north, in the town of Pripyat, is the Chernobyl nucl...

Korea

(Encyclopedia)CE5 Korea kôrēˈə, kə– [key], Korean Hanguk or Choson, region and historic country (85,049 sq mi/220,277 sq km), E Asia. A peninsula, 600 mi (966 km) long, Korea separates the Sea of Japan (c...

seismology

(Encyclopedia)seismology sīzmŏlˈəjē, sīs– [key], scientific study of earthquakes and related phenomena, including the propagation of waves and shocks on or within the earth by natural or artificially genera...

Mottelson, Benjamin Roy

(Encyclopedia)Mottelson, Benjamin Roy, 1926–, Danish physicist, b. Chicago, Ph.D. Harvard, 1950. Raised and educated in the United States, he moved to Denmark, where he began work as a nuclear physicist. Mottelso...

deuterium

(Encyclopedia)deuterium do͞otērˈēəm [key], isotope of hydrogen with mass no. 2. The deuterium nucleus, called a deuteron, contains one proton and one neutron. Deuterium is also called heavy hydrogen, and water...