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space exploration
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Images & Videos
Astronaut outside the International Space Station Eagle Nebula Apollo 11
Discover the importance of Sputnik, Yuri Gagarin, Apollo 11, the Hubble Space Telescope, and SpaceShipOne
Hurricane Irene Cassini-Huygens spacecraft
explorations of Mars
Corona reconnaissance satellite images TIROS 7 International Space Station, 2000
For Students
Buzz Aldrin on the Moon
space exploration summary
Quizzes
View of the Andromeda Galaxy (Messier 31, M31).
Astronomy and Space Quiz
The orbits of the planets and other elements of the solar system, including asteroids, Kuiper belt, Oort cloud, comet
Space Odyssey
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
Soil cohesiveness demonstrated in bootprint of Buzz Aldrin, Apollo 11. footprint; foot print; moon
Space Exploration
Earth from space. Full-hemisphere views of the Earth showing Hurricane Linda at its peak approaching Baja California on 1997 September 11.
Human Exploration: From Earth to Space
Read Next
July, 2006, Launch of Space Shuttle Discovery STS-121. See attached for full caption information.
Will Light-Speed Space Travel Ever Be Possible?
Apollo 11 Lunar Module with its four landing-gear footpads deployed. This photograph was taken from the Command Module as the two spacecraft moved apart above the Moon.
5 Unforgettable Moments in the History of Spaceflight and Space Exploration
Apollo 12 astronaut Charles "Pete" Conrad stands beside the U.S. flag after is was unfurled on the lunar surface during the first extravehicular activity (EVA-1) Nov. 19, 1969. Footprints made by the crew can be seen in the photograph.
How Many People Have Been to the Moon?
Voskhod. The first human in space. Three stills from an external movie camera on the Soviet Voskhod 2 records pilot Aleksey Leonov historic 10 min. spacewalk, March 18, 1965. Leonov extravehicular activities (EVA) was the first human to ever walk in space
The First Space Walk
After a perfect launch, spectators try to catch a last glimpse of Space Shuttle Columbia, barely visible at the top end of the twisted column of smoke.
7 Accidents and Disasters in Spaceflight History
Discover
King Cobra snake in Malaysia. (reptile)
9 of the World’s Deadliest Snakes
Chapter 4 pg 42 - Chapter header of The Adventures of Tom Sawyer by Mark Twain. Published in 1884 by The American Publishing Company
Periods of American Literature
halloween, jack o lantern, pumpkin, gourd
Why Do We Carve Pumpkins at Halloween?
Day of the Dead. skeleton to celebrate Day of the Dead aka Dia de los Muertos holiday in Mexico. La Calavera Catrina. Roman Catholicism moved holiday to coincide with All Saints Day and All Souls Day (November 1 and 2).
Feliz Día de los Muertos
An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.
11 Egyptian Gods and Goddesses
Group of children and their parents playing trick or treat on Halloween.
Why Do We Celebrate Halloween?
Globe South America, map
What’s the Difference Between Hispanic and Latino?
Astronaut outside the International Space Station
Astronaut outside the International Space Station U.S. space shuttle astronaut Michael Lopez-Alegria floating in space outside the Unity module of the International Space Station in October 2000, during an early stage of the station's assembly in Earth orbit.

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Written by
John M. Logsdon
John M. Logsdon is Professor Emeritus of Political Science and International Affairs at George Washington University’s Elliott School of International Affairs. He was a member of the NASA Advisory Council...
John M. Logsdon
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The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.
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space exploration, investigation, by means of crewed and uncrewed spacecraft, of the reaches of the universe beyond Earth’s atmosphere and the use of the information so gained to increase knowledge of the cosmos and benefit humanity. A complete list of all crewed spaceflights, with details on each mission’s accomplishments and crew, is available in the section Chronology of crewed spaceflights. Humans have always looked at the heavens and wondered about the nature of the objects seen in the night sky. With the development of rockets and the advances in electronics and other technologies in the 20th century, it became possible ...(100 of 22189 words)

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