This animation shows how krypton (red) is removed from xenon gas (blue) by flowing the combined gases through a column of charcoal (black specks)...
One of modern science’s biggest mysteries is dark matter, an invisible form of matter that shapes galaxy rotation and bends rays of light. No one knows what dark matter is, but scientists are carrying out a number of experiments to learn more.
Physics of the universe
Astrophysics and cosmology