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solar system to scale
A white man in glasses holds a microphone under the text. Ask an Editor, and. What is planetary alignment?, against a starry space background.
The Sun and planets in its orbit.
Learn about the dwarf planets within our solar system
Explore exoplanets and the techniques used to detect them
Which of these planets is made up mostly of gases? Diagram showing the Moon orbiting Earth, with arrows illustrating gravitational forces between them and how gravity alters the Moon's natural path, resulting in its curved orbit around the planet.
Know the ten interesting facts that prove the earth is round
At a Glance
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planet summary
Quizzes
Model of a molecule. Atom, Biology, Molecular Structure, Science, Science and Technology. Homepage 2010 arts and entertainment, history and society
Science Quiz
The orbits of the planets and other elements of the solar system, including asteroids, Kuiper belt, Oort cloud, comet
Space Odyssey
Saturn. Saturn and its rings. Second largest planet of the solar system. Space Art
Planets and the Earth’s Moon
1 July 2002: The Solar and Heliospheric Observatory (SOHO) satellite reveals a massive solar eruption more than 30 times the Earth's diameter. The eruption formed when a loop of a magnetic field over the surface of the Sun trapped hot gas.
Brightest Star in the Solar System
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
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Videos

When Was the Last Time All the Planets Aligned?
Let's go on a planetary parade.
Video: Encyclopædia Britannica, Inc.
Why Isn't Pluto a Planet?
Being a dwarf planet isn't really a downgrade.
Video: Encyclopedia Britannica INC.
Learn about the dwarf planets within our solar system
Learn about dwarf planets.
Video: JPL/NASA
Explore exoplanets and the techniques used to detect them
Learn about extrasolar planets (exoplanets) and the techniques used to detect them.
Video: © Massachusetts Institute of Technology (A Britannica Publishing Partner)
Know the ten interesting facts that prove the earth is round
Ten reasons why Earth is round.
Video: © MinutePhysics (A Britannica Publishing Partner)

Images

solar system to scale
The eight planets of the solar system and Pluto, in a montage of images scaled to...
NASA/Lunar and Planetary Laboratory
effects of gravity on the Moon and Earth
Effects of gravity on Earth and the Moon.
Encyclopædia Britannica, Inc.

Interactives

Which of these planets is made up mostly of gases?
Encyclopædia Britannica, Inc
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