There might be new particles, forces and perhaps even a Dark Big Bang
paper will probably need no reminder that most of the universe is missing. The atoms and light you see—from people to planets, stars and galaxies—make up just 5% of the universe. The rest is a two-part mystery—a substance called “dark energy”, which pushes space apart, comprises 68% of the cosmos; what’s left, around 27%, is dark matter.
For decades astronomers have been able to measure how dark matter behaves and can point to parts of the sky where it must exist. But what it actually), suggests that dark matter is a fluid of particles that move sluggishly relative to the speed of light, and interact with each other and everything else in the universe mainly through gravity.
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