Question

define a galaxy and constellation

Answer 1

Hi , here is your answer-
we see a faint band of light running across the heavens in clear sky at night is called Galaxy.

A group of Stars is known as constellation.
hope it will help !

Answer 2

Galaxy - A galaxy is the system of stars containing the sun and it's planets, seen as a bright band in the sky.
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Constellation- A group of stars that forms a shape in the sky and has a name.
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hope it helps you