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"So, they're just this plasma stuff, held together by gravity, and all we're really seeing is the radiation they're giving off from light years away?"
Sheldon stared at Penny - eyes wide with surprise at her shockingly accurate, if poorly worded, description of the field of stars high above them in the night sky, that proved she actually did listen to him sometimes - and then she turned to stare back at him, a look in her eyes that was both questioning and concerned until he finally spoke.
"I love you."