Explorer

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U.S. Explorer 10 satellite shown undergoing testing in a National Aeronautics and Space Administration laboratory. Explorer 10 was launched March 25, 1961, and relayed magnetic field data from a high Earth orbit. The satellite was one of more than 50 scientific spacecraft launched as part of the Explorer program between 1958 and 1975.

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The Space Shuttle Columbia soars from Launch Pad 39A on July 1 1997 to begin the 16-day STS-94 Microgravity Science Laboratory-1 (MSL-1) mission.

12 Questions About the History of Space Exploration Answered

Planet Earth and lunar moon from space

Where Did the Moon Come From?

Space race (1957-1969) infographic between United States (U.S.) and Russia. America, Soviet Union, U.S.S.R., space exploration

Timeline of the Space Race, 1957–69

In Frankfurt, Germany, a driver uses a car GPS infotainment display system to guide them on a German autobahn. lanes; traffic; navigation; travel; map

How Does GPS Work?

solar eclipse, sun, moon, astronomy, space

How Do You Tell the Difference Between Total, Annular, Solar, and Lunar Eclipses?

Discover

Bar graph of the United States Death Toll during major events. Infogram chart.

U.S. Death Toll During Major Events

The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Moonrise over Tucson, Arizona

Why Doesn’t Arizona Observe Daylight Saving Time?

Rural Irish landscape, Sligo, Ireland.

Why Is Ireland Two Countries?

Hindu Holi Festival celebrations with colored water, powder and colorful flower petals thrown over celebrants at a Hindu temple in Mathura, Uttar Pradesh, India on March 24, 2021.

Holi: Festival of Colors

airplane in flight (plane, aircraft, flying)

7 Puzzling Plane Disappearances

Explorer: Related Content

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Photos

U.S. Explorer 10 satellite shown undergoing testing in a National Aeronautics and Space Administration laboratory. Explorer 10 was launched March 25, 1961, and relayed magnetic field data from a high Earth orbit. The satellite was one of more than 50 scientific spacecraft launched as part of the Explorer program between 1958 and 1975.

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Topics

Earth satellite Sputnik Telstar Science and Technology Satellite Kosmos Landsat Kwangmyŏngsŏng Vela Discoverer Midas THEMIS

Key People

Wernher von Braun

Wernher von Braun

German-born American engineer

Pickering, William Hayward; Johnson, Lyndon

William Hayward Pickering

American engineer and physicist

Quiz

Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.

All About Astronomy

List

The Space Shuttle Columbia soars from Launch Pad 39A on July 1 1997 to begin the 16-day STS-94 Microgravity Science Laboratory-1 (MSL-1) mission.

12 Questions About the History of Space Exploration Answered