You may all think that dark matter is not made up of light since after all its called dark matter but physicists thought other wise. All of us wonder what is the space that makes up space in space, confusing. In other words what is area in space. All the people thought that photons, particles of light make up 85 percent of the universes matter. But now with new research they might be heavy photons. It will be a small amount of mass and carry an unknown force that makes it interact with normal photons.We know this because when something with mass passes a black hole it gets sucked in but something with no mass will just pass by it but a in between mass will go into it and steal some of its energy so it makes the black hole stop spinning. They calculated that if it were to make it stop moving it would have to weight 10-20 electronvolts.
The mystery of missing mass in the Universe is fascinating! Have you seen infra-red images of galaxies in space. There's a lot out there that the human eye can't see.
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