Monday's Riddle! Order in Line

Hello Riddlers! Here's the puzzle. Can you guess the theme this week? Vacation was a blast, but it's sure nice to come home ; ) ~ F

I'm not the youngest or oldest in line. I can't claim largest or smallest as mine. I dwell in the middle of a cold, dark place, keeping in time with a circular pace. Something bright is the star of the show. It strings me along and gives me my glow. I spin and spin; go round and round- watch the skies stir rocky ground. I've known crashing and banging, seen veils of dust. I like luminescent colors that oxidize rust. My brothers and sisters share my space- they watch the expressions on my face. For, I am as unique as can be. If you take a quick look around, surly you'll see. 

What am I? 

I gave you a clue!



FEAR NOT THE UNEXPECTED