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cosmology
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Examine the observable universe's place within the whole universe
Andromeda Galaxy big bang model curved space-time experimental evidence for general relativity intrinsic curvature of a surface relative size of the universe Wilkinson Microwave Anisotropy Probe evolution of the universe supernova 1987A in the Large Magellanic Cloud
For Students
Andromeda Galaxy
cosmology summary
Quizzes
The orbits of the planets and other elements of the solar system, including asteroids, Kuiper belt, Oort cloud, comet
Space Odyssey
Ursa major constellation illustration art. (Big Dipper) stars, space, night sky)
Stars: Explosions in Space
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
Horologist Roman Piekarski starts the time consuming task of adjusting the 600 antique clocks at Cuckooland Museum in readiness for this weekends change to British summer time on March 23, 2009 in Knutsford, England.
Ologies Quiz
Read Next
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?
Colorful winter sunset
What's the Difference Between a Solstice and an Equinox?
Discover
Solar Eclipse, Eclipse, Solar Flare, Outer Space, Astronomy
What Causes Lunar and Solar Eclipses?
Julius Caesar in full Gaius Julius Caesar (100? BCE-44 BCE) statue in Rimini, Italy. Roman general and statesman and dictator
The Time Julius Caesar Was Captured by Pirates
earthquake. Heavily damaged school in the town of Yingxiu after a major earthquake struck China's Sichuan Province on May 12, 2008.
The 6 Deadliest Earthquakes Since 1950
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
Black widow spider
9 of the World’s Deadliest Spiders
Albert Einstein in Washington, D.C. c. 1921-1923. Physicist
The Solar Eclipse That Made Albert Einstein a Science Celebrity
Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere
Why Do Some Cicadas Appear Only Every 17 Years?

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Videos

Examine the observable universe's place within the whole universe
Learn about defining and measuring the observable universe within the “whole” universe.
Video: © MinutePhysics (A Britannica Publishing Partner)
Planck length: why string theory is hard to test
The Planck scale is described as the arena in which both quantum mechanical and gravitational...
Video: © World Science Festival (A Britannica Publishing Partner)
Explore Karl Schwarzschild's point of no return and the event horizons
Learn about Karl Schwarzschild and his work concerning event horizons, notably the...
Video: © Open University (A Britannica Publishing Partner)
Know about the Millennium Simulation at the Max Planck Institute for Astrophysics and learn how to simulate the universe on a personal computer
An overview of the Millennium Simulation run by researchers at the Max Planck Institute...
Video: © MinutePhysics (A Britannica Publishing Partner)
Listen to astrophysicist Neil deGrasse Tyson narrate a brief history of the formation of the universe, from the big bang to the present
Astrophysicist Neil deGrasse Tyson narrating a brief history of the universe, from...
Video: © MinutePhysics (A Britannica Publishing Partner)

Images

Andromeda Galaxy
The Andromeda Galaxy, also known as the Andromeda Nebula or M31. It is the closest...
© Giovanni Benintende/Shutterstock.com
big bang model
According to the evolutionary, or big bang, theory of the universe, the universe...
Encyclopædia Britannica, Inc.
curved space-time
The four dimensional space-time continuum itself is distorted in the vicinity of...
Encyclopædia Britannica, Inc.
experimental evidence for general relativity
In 1919 observation of a solar eclipse confirmed Einstein's prediction that light...
Encyclopædia Britannica, Inc.
intrinsic curvature of a surface
Intrinsic curvature of a surface.
Encyclopædia Britannica, Inc.
relative size of the universe
How the relative size of the universe changes with time in four different models....
Encyclopædia Britannica, Inc.
Wilkinson Microwave Anisotropy Probe
A full-sky map produced by the Wilkinson Microwave Anisotropy Probe (WMAP) showing...
NASA/WMAP Science Team
evolution of the universe
Immediately after the big bang (1), the universe was filled with a dense “soup” of...
Encyclopædia Britannica, Inc.
supernova 1987A in the Large Magellanic Cloud
This picture shows the faint outer rings and bright inner ring characteristic of...
Photo AURA/STScI/NASA/JPL (NASA photo # STScI-PRC98-08d)
gravitational lens
In this picture a galactic cluster, about five billion light-years away, produces...
Photo AURA/STScI/NASA/JPL (NASA photo # STScI-PRC96-10)
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