ORBITAL 轨道桥
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Celestial bodies

月相
Moon phase

The shape of the Moon's lit half as seen from Earth.

The cycle runs 29.53 days from new moon to new moon.

Related terms
  • The Moon — Earth's only natural satellite, 3474 km across.
  • Comet — An icy body that grows a tail near the Sun.
  • Asteroid — Small rocky bodies, mostly between Mars and Jupiter.
  • Milky Way — Our own galaxy seen edge-on as a band of light.

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