And, all three involve shadows! What’s the difference between the three, you ask? It all has to do with the angular size of the two astronomical objects involved: When two objects that are roughly the ...

A shadow is a dark shape made when light is stopped or blocked by an object or a person. Some objects are opaque such as stone, metal and wood. This means light doesn't travel through them.

or translucent objects like this clear silicone lid. But a shadow forms when an opaque, or non-transparent, object blocks light from passing through and reaching a surface on the other side.