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orbit
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Earth's orbit
Understand how the Earth remain stable in orbit around the sun
What causes the seasons?
Planet's orbital plane in relation to the ecliptic Anomaly A-aphelion; B-perihelion; C-centre of the orbit; E-eccentric anomaly; P-planet; S-Sun; V-true anomaly satellite orbits effects of gravity on the Moon and Earth A Poincaré section, or mapThe trajectory, or orbit, of an object x is sampled periodically, as indicated by the blue disk. The rate of change for the object is determined for each intersection of its orbit with the disk, as shown by P(x) and P2(x). This set of values can then be used to analyze the long-term stability of the system. For contrast, note the perfectly periodic orbit of the point o, as indicated by o = P(o).
Study how Earth's gravity influences the Moon in maintaining its rotation in sync, with one side forever facing Earth
Learn about Io, Jupiter's moon with the most active volcanoes in the solar system
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
Discover
New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.
Why Is It Called Black Friday?
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
Diverse elementary school children wearing school uniforms running outside of school. Boys girls
Pro and Con: School Uniforms
A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England
Inventors and Inventions of the Industrial Revolution
Iraqi Army Soldiers from the 9th Mechanized Division learning to operate and maintain M1A1 Abrams Main Battle Tanks at Besmaya Combat Training Center, Baghdad, Iraq, 2011. Military training. Iraq war. U.S. Army
8 Deadliest Wars of the 21st Century
The Cheshire Cat is a fictional cat from Lewis Carroll's Alice's Adventures in Wonderland. (Alice in Wonderland)
11 Banned Books Through Time
Title: Senate Square, St. Petersburg, December 14, 1825: repression of the troop mutiny - watercolor by Carl Ivanovitch Kollman, 1825 depicts Decembrist uprising clashing with cavalry, with spectators watching. (new style December 26, 1825) Europe. Saint
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Videos

Understand how the Earth remain stable in orbit around the sun
How Earth is able to remain in orbit by balancing speed and gravitational pull from...
Video: © MinutePhysics (A Britannica Publishing Partner)
What causes the seasons?
In many parts of the world, weather cycles through the four seasons like clockwork:...
Video: Encyclopædia Britannica, Inc.
Study how Earth's gravity influences the Moon in maintaining its rotation in sync, with one side forever facing Earth
Learn about the role that Earth's gravity plays in keeping one hemisphere of the...
Video: © MinuteEarth (A Britannica Publishing Partner)
Learn about Io, Jupiter's moon with the most active volcanoes in the solar system
An overview of Io, a moon of Jupiter with many active volcanoes.
Video: © Open University (A Britannica Publishing Partner)
Learn more about the Nice model of solar system evolution and how samples brought back from the Moon fit within it
A discussion of the Nice model (named for Nice, France) of the formation of the orbital...
Video: © Open University (A Britannica Publishing Partner)
How Earth's orbit and tilt create seasons
The role of Earth's orbit and axis in determining its seasons.
Video: Encyclopædia Britannica, Inc.
Understanding Newton's theory of universal gravitation
Isaac Newton's formulation of the law of universal gravitation.
Video: Encyclopædia Britannica, Inc.
How does Earth orbit around the Sun?
Explanation of how objects under the influence of gravity move in orbits.
Video: Encyclopædia Britannica, Inc.

Images

Earth's orbit
Earth's orbit around the Sun. Earth orbits around the Sun with a period of one year.
Encyclopædia Britannica, Inc.
Encyclopædia Britannica, Inc.
Anomaly A-aphelion; B-perihelion; C-centre of the orbit; E-eccentric anomaly;...
Encyclopædia Britannica, Inc.
satellite orbits
Basic characteristics of orbits in which a satellite can be placed around Earth,...
Encyclopædia Britannica, Inc.
effects of gravity on the Moon and Earth
Effects of gravity on Earth and the Moon.
Encyclopædia Britannica, Inc.
A Poincaré section, or mapThe trajectory,...
Encyclopædia Britannica, Inc.
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