sky

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

n the atmosphere and outer space as viewed from the earth

Types:
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:
atmosphere
the envelope of gases surrounding any celestial body

v throw or toss with a light motion

Synonyms:
flip, pitch, toss
Types:
submarine
throw with an underhand motion
lag
throw or pitch at a mark, as with coins
throw back, toss back
throw back with a quick, light motion
Type of:
fling
throw with force or recklessness

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