What can you use to demonstrate that matter is made up of tiny particles?

Your room is still fairly dark when you wake up early one morning. you look over at your shirt hanging on a hook. you know it's your red shirt because you hung it up there before you went to bed, but in the dark you can't see its color. it looks dark gray to you. why is that?

Explain the popular saying "we are made of stardust. how are we made of stardust? use scientific vocab.

Would enjoy a movie about the subject