Why is the sky blue? Why does water evaporate at room temperature? Why does the moon have phases?
Do you know?
I think there are some basic science questions that everyone should be able to answer. A lot of these are covered in basic science classes. But maybe you didn’t cover them in class. Or maybe you forgot. Or maybe you didn’t quite understand it correctly back then. I was reminded recently that the latter case may be more prevalent than we think.
So today I thought I’d share an explanation of one that perhaps hasn’t crossed your mind recently: why is the night sky dark?