http://www.abc.net.au/news/2016-01-2...iverse/6994612
"Only 5 per cent of the universe is made of ordinary material like planets, stars, cars, and coffee. This "normal matter" is made mostly of protons, neutrons, and electrons.
Another 24 per cent is an exotic material that interacts through gravity, but produces no light, making it invisible to us. We call this "dark matter".
While dark matter only interacts with normal matter very weakly, particle physicists have plausible candidates for what dark matter is."
This is quite astounding. Only 5% of the universe is accessible to our senses. Would I be correct in assuming that scientists have postulated the existence of substances/forces called dark matter and dark energy? Neat. I'm guessing that science has arrived at these conclusions because the universe needs to have more 'substance' to account for its present (observable) behaviour?