B1 an extremely large, round mass of rock and metal, such as Earth, or of gas, such as Jupiter, that moves in a circular path around the sun or another star行星
More examples
The planet Jupiter radiates twice as much heat from inside as it receives from the Sun.
an unmanned mission to the planet Mars
They launched a rocket to the planet Venus.
Environmentalists have no political axe to grind - they just want to save the planet.
Is it too late to repair the damage we have done to our planet?
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