dark matter

Dark matter is an invisible, mysterious substance that scientists believe makes up most of the universe. It’s like the ghost of the universe, since it’s everywhere but you can’t see it, hear it, or feel it. Not only that, but it’s even more mysterious because scientists haven’t been able to figure out what it is! It’s like a great cosmic mystery and nobody can solve it. Here’s a fun fact: if dark matter were visible, it would outshine all the stars in the sky!