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Highway Night Traffic Portland, drive, driving, car, automobile.

What's the Difference Between Speed and Velocity?

Galaxy clusters like Abell 2744 can act as a natural cosmic lens, magnifying light from more distant, background objects through gravity. NASA's James Webb Space Telescope may be able to detect light from the first stars in the universe if they are gravitationally lensed by such clusters. (astronomy, space exploration, galaxies)

How Fast Is the Universe Expanding?

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

Discover

Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

Currency. Money. Cash. Dollars. Bills. Pile of ten, twenty, fifty, and hundred dollar bills.

6 Questions About the History of Money and Banking Answered

Shah Jahan. Taj Mahal. Mughal architecture. Emperor Shah Jahan fifth Mughal Emperor (reigned 1628-1658) India, Himachal Pradesh, Basohli or Jammu and Kashmir, Mankot, circa 1690 Drawings; Opaque watercolor, gold, and ink on paper (see notes)

6 Important Mughal Emperors

Nazi Germany, Nazi SS troops marching with victory standards at the Party Day rally in Nuremberg, Germany, 1933. (Schutzstaffel, Nazi Party, Nurnberg)

Why Was Nazi Germany Called the Third Reich?

Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

7 of the World’s Deadliest Shipwrecks

Fish. Lionfish. Lion-fish. Turkey fish. Fire-fish. Red lionfish. Pterois volitans. Venomous fin spines. Coral reefs. Underwater. Ocean. Red lionfish swims by seaweed.

10 of the World’s Most Dangerous Fish

Two chicks near an egg with a white background (poultry, chick, chickens, birds).

What Do Eggs Have to Do with Easter?

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Topics

precession

Key People

James Bradley, detail of an oil painting after Thomas Hudson, c. 1742-47; in the National Portrait Gallery, London

James Bradley

English astronomer