Ask the ChatbotGames & QuizzesHistory & SocietyScience & TechBiographiesAnimals & NatureGeography & TravelArts & CultureProConMoneyVideos
Block I
Directory
References
Discover
The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)
New Seven Wonders of the World
Bolshoy Ice Dome during ice hockey Men's Prelim. Sochi 2014 XXII Olympic Winter Games
7 Ways Hosting the Olympics Impacts a City
Vietnam War. U.S. President Lyndon B. Johnson awards the Distinguished Service Cross to First Lieutenant Marty A. Hammer, during a visit to military personnel, Cam Ranh Bay, South Vietnam, October 26, 1966. President Johnson
Vietnam War Timeline
World Data Locator Map: Australia
Is Australia an Island?
VAN, TURKEY - OCTOBER 25: A building and car ruined during the earthquake of Van-Ercis on October 25, 2011 in Van, Turkey. It is 604 killed and 4152 injured in Van-Ercis Earthquake.
What Is an Aftershock?
Charles Darwin, carbon print photograph by Julia Margaret Cameron, 1868.
What Darwin Got Right (and Wrong) About Evolution
Close up of papyrus in a museum.
Before the E-Reader: 7 Ways Our Ancestors Took Their Reading on the Go

Block I

satellite

Learn about this topic in these articles:

Navstar system

  • GPS satellite
    In GPS: The Navstar system

    …first satellite was an experimental Block I model launched in 1978. Nine more of these developmental satellites followed over the next decade, and 23 heavier and more-capable Block II production models were sent into space from 1989 to 1993. The launch of the 24th Block II satellite in 1994 completed…

    Read More
Britannica Chatbot logo

Britannica Chatbot

Chatbot answers are created from Britannica articles using AI. This is a beta feature. AI answers may contain errors. Please verify important information using Britannica articles. About Britannica AI.