“Here’s a question for you: What is the stuff that makes up the majority of the universe? Stars and galaxies? Hydrogen gas? Planets like ours? Nope. It’s none of them. Here’s a hint: we have absolutely no idea.
According to the latest observational evidence, ordinary matter, including stars and planets, only make up a tiny fraction of the universe (5%). The rest is the elusive dark matter (25%) and dark energy (70%).”