Want to see the sky? Go outside and look up! That’s assuming you’re not on Mars, of course. Everything you see above the surface of the Earth is the sky.

Astronomers use the term "celestial sphere" for the sky. It's the space that includes everything we can see from our earthbound perspective, including clouds, stars, the sun, and the moon. If your uncle takes you out for ice cream and says, "The sky's the limit!" he means that there is no limit at all—you can order anything, even an enormous banana split.

Definitions of sky
  1. noun
    the atmosphere and outer space as viewed from the earth
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    blue, blue air, blue sky, wild blue yonder
    the sky as viewed during daylight
    mackerel sky
    a sky filled with rows of cirrocumulus or small altocumulus clouds
    type of:
    the envelope of gases surrounding any celestial body
  2. verb
    throw or toss with a light motion
    synonyms: flip, pitch, toss
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    throw with an underhand motion
    throw or pitch at a mark, as with coins
    throw back, toss back
    throw back with a quick, light motion
    type of:
    throw with force or recklessness
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