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Moons are planets too – Phys.org
What makes a planet a planet? The answer turns out to be rather contentious. The official definition of a planet, as defined…

What makes a planet a planet? The answer turns out to be rather contentious. The official definition of a planet, as defined by the International Astronomical Union (IAU) is that a planet must satisfy three conditions:
- It must orbit the sun.
- It must be in…
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