What is a universe a common noun or a proper noun?

The noun universe is a common noun, a general Word for space and everything that exists in it, including the Earth and all the other planets; a general Word for a particular sphere of activity, interest, or experience; a Word for any universe of any kind.

A proper noun is the name of a specific person, place, or thing; for example:

• Miss Universe
• Leveraging the Universe by Mike Dooley
• Universe Drive, Levittown, NY
• Stargate Universe, TV series