"If you're puzzled by what dark energy is, you're in good company"

This quote by Saul Perlmutter is describing the concept of dark energy, which is a mysterious form of energy that is believed to make up the majority of deep space. It is an idea that is still not completely comprehended by researchers, and it is something that has actually puzzled them for many years. By stating "you're in good company", Perlmutter is indicating that if you are confused by dark energy, you are not alone. He is suggesting that even the most knowledgeable researchers are still trying to determine what dark energy is and how it works. This quote is a reminder that even the most complex scientific concepts can be challenging to comprehend, which it is okay to be confused by them.