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Double planet
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In astronomy, a double planet is a binary satellite system where both objects are planets, or planetary-mass objects, and whose barycenter is external to both planetary bodies.
Visual comparison of the sizes of Earth and the Moon (above right) and Pluto–Charon (below right)
Visual comparison of the sizes of Earth and the Moon (above right) and Pluto–Charon (below right)
The Pluto–Charon system is closer to binary than the Earth–Moon system (distance not to scale).
The Pluto–Charon system is closer to binary than the Earth–Moon system (distance not to scale).
The Earth–Moon system is sometimes informally referred to as a double planet (masses are roughly proportional to volumes, not surface area).
The Earth–Moon system is sometimes informally referred to as a double planet (masses are roughly proportional to volumes, not surface area).
Artist's impression of the Eris-Dysnomia system
Artist's impression of the Eris-Dysnomia system
Moon
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The Moon is the only natural satellite of Earth. It orbits around Earth at an average distance of 384,399 kilometers, a distance roughly 30 times the width of Earth. It completes an orbit in relation
Double planet
…hypothesis are gravitationally stable only under particular circumstances. The Solar System does not have an official double planet, however the Earth–Moon system is sometimes considered to be one. In promotional materials advertising the SMART-1 mission, the European Space Agency referred to the Earth–Moon…
The near side of the Moon with the lunar north pole at the top
The near side of the Moon with the lunar north pole at the top
Size comparison of the main moons of the Solar System with Earth to scale. Nineteen moons are large enough to be round, several having subsurface ocea
Size comparison of the main moons of the Solar System with Earth to scale. Nineteen moons are large enough to be round, several having subsurface oceans and one, Titan, having a considerable atmosphere.
Surveyor 7 observes levitating dust, a phenomenon named Lunar horizon glow can be seen
Surveyor 7 observes levitating dust, a phenomenon named Lunar horizon glow can be seen
Astronaut Charles Duke working on the Moon with his suit covered in lunar dust. Lunar dust is highly abrasive and can cause damage to human lungs and
Astronaut Charles Duke working on the Moon with his suit covered in lunar dust. Lunar dust is highly abrasive and can cause damage to human lungs and nervous and cardiovascular systems.