0 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
Might there be intelligent life on other planets? 其他星球上有可能存在智慧生物嗎？
The planet Jupiter radiates twice as much heat from inside as it receives from the Sun.
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?
The contrast between planets and stars being the least in the infrared wavelength region, that has been chosen for this mission.
The duration of this phase is poorly understood, but during this time the terrestrial planets were not isolated.
To the contrary, those on other planets have only been able to eke out a decent living by dint of incredibly hard work.
