What is dark matter? As CERN boffins fire up Large Hadron Collider to hunt for it

dailystar.co.uk:

The brains behind the Large Hadron Collider are firing up the machine in the hunt for dark matter, which could blow our understanding of physics and the universe wide open.The European Organisation for Nuclear Research, known as CERN, in Switzerland are firing up their mega-machine after a long delay of maintenance closures.The collider has been responsible for exciting developments in the world of science since it was first built, such as when the "God Particle" was discovered in 2012.Scientists can't yet confirm if dark matter actually exists by seeing it, as it does not behave in the same way we would understand.Dark-matter theorist Tim Tait said: "The LHC has really broken new ground in the search for dark matter in the form of weakly interacting massive particles, by covering a wide array of potential signals predicted by either production of dark matter, or production of the particles mediating its interactions with ordinary matter."Dark matter is said to make up around 35% of the whole universe and is 'known' about because without it, the rest of the universe would not make sense.When calculations were made to look at how the universe is structured in the way it is, it became apparent to boffins that the gravity of normal matter is not strong enough to form galaxies.The idea is that if no such thing as dark matter existed, then stars would likely not form galaxies in the first place.

So, there must be something else holding it all together.Swiss astronomer Fritz Zwicky looked at how galaxies moved in a part of the universe known as Coma Cluster.