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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

Above the clouds 130 nautical miles below, astronaut Mark C. Lee floats freely without tethers as he tests the new Simplified Aid for Extravehicular Activity (EVA) Spacewalk Rescue (SAFER) system, Sept. 16, 1994. Space Shuttle Discovery, STS-64

Gravity: From Apples to the Universe

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

Colorful winter sunset

What's the Difference Between a Solstice and an Equinox?

Discover

The impeachment trial of Pres. Andrew Johnson, illustration from Frank Leslie's Illustrated Newspaper, March 28, 1868.

What If the President Is Impeached?

Abstract vector hi speed internet technology background

History of Technology Timeline

The first contingent of the Women's Overseas Hospitals, supported by the National American Woman Suffrage Association. (World War I)

Women in World War I: A Photo Gallery

Orange basketball on black background and with low key lighting. Homepage 2010, arts and entertainment, history and society

The 10 Greatest Basketball Players of All Time

Flag of Bhutan

6 Small Kingdoms of the World

Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

10 Famous Artworks by Leonardo da Vinci

United States Electoral College votes by state

How Many Electoral College Votes Does Each U.S. State Have?

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Moon Moon exploration space probe Viking Chang’e Chandrayaan Voyager Messenger Venera Pioneer Lunar Prospector Surveyor Luna

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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