An asterism. If this is for classwork, your teacher may be expecting the answer "constellation," which technically speaking is not a pattern of stars but a designated area of sky. You'll have to decide which to use based on how competent you think your teacher is.
A pattern of stars in the sky is called a Constellation!(: The name for a pattern of stars is an Asterism, of which the named Constellations are some but not all.
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Constellation
Constellations
Constellations
Those would be "constellations".
a pattern or picture made up of stars in the night sky
Constellation
A constellation.
a pattern or picture made up of stars in the night sky
The group of stars is called Constellation. I think it's cluster.
A pattern of stars which seems to move across the night sky together is called a constellation. Hope this helped :D