Dark Matter is just as interesting on a cosmic level.
Tantalising hints of dark matter — the mysterious substance thought to make up a quarter of the Universe — have been picked up for the first time, in an American laboratory buried half a mile underground.
Invisible forces out in space used to be considered before Einstein to try to help explain the universe and now dark matter and dark energy have been proposed.
Is there such a concept as "dark time" or "dark gravity?"
The standard explanation for dark matter is that it is composed of particles that barely interact with normal matter, effectively passing straight through the Earth while leaving no trace. This quality — which explains the WIMP acronym — also makes the particles exceptionally difficult to observe.
