It's dark energy (placeholder name for what we'll eventually determine it to be) that's pushing the Universe apart. Gravity, a feature of "simple" matter (vice dark matter) isn't strong enough to overcome dark energy, so the universe is expanding.
A few hundred people on the planet have a good grasp on that, so don't feel like you're missing a sandwich.
A few hundred people on the planet have a good grasp on that, so don't feel like you're missing a sandwich.
