The Big Bang Theory: 10 Times Penny Was Far Smarter Than The Guys
Penny Found The Comet, Not Raj
In the 11th season, the gang went up to the rooftop of their building to see Mercury, but shockingly, when Penny looked in the telescope, she found something different — a comet.
Raj denied her findings and told her it wasn't a comet but after further investigation, she was right.