Astronomiac

Astronomiac; noun

a person who loves astronomy so much that he/she would sit on the roof of their house late at night and watch the stars for hours.

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"You're such an astronomiac."

"Astronomiac isn't a word."

"In my world it is."

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Gemini is a star lover. She loves how in her town, it's so quiet and there's barely any lights on so she can see all the stars from the rooftop of her suburban house.

Draco, (not the wizard) is also an astronomy lover. He's amazed how the big the universe really is and how planet Earth is like a little spec in this big world we live in.

Both Draco and Gemini sit on their rooftops late at night. I guess you could call them, astronomiacs.