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Earth from space. Full-hemisphere views of the Earth showing Hurricane Linda at its peak approaching Baja California on 1997 September 11.

What Is Earth’s Velocity?

Solar system illustration. (planets; sun)

Why Are Planets Round?

Remarkable new details of Pluto's largest moon Charon are revealed in this image from New Horizons' Long Range Reconnaissance Imager (LORRI), taken late on July 13, 2015 from a distance of 289,000 miles

Why Is Pluto No Longer a Planet?

Astronomical Observatory of the Mojon del Trigo. Long exposure using the star trail technique. Sierra Nevada National Park, in the province of Granada, Andalusia.

Is Earth Going to Change the Direction in Which It Rotates?

Lead image for "A Timeline of the World in 8 Maps"

A Timeline of the World in 8 Maps

Discover

Polar bear leaping among ice floes at Spitsbergen, Svalbard archipelago, Norway, the Arctic. Sea ice climate change mammal jump global warming

All 81 References in Fall Out Boy’s “We Didn’t Start the Fire,” Explained

Germans from East and West stand on the Berlin Wall in front of the Brandenburg Gate in the November 10, 1989, photo, one day after the wall opened.

Timeline of the 1980s

green digital binary symbols

What Comes After Terabyte?

William Shakespeare

The Death of Shakespeare

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

Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)

All 119 References in “We Didn’t Start the Fire,” Explained

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

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Topics

argentite sulfide mineral chalcocite stromeyerite pyrite galena antimonide arsenide stibnite sphalerite orpiment arsenopyrite

Quiz

Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.

(Bed) Rocks and (Flint) Stones