In modern physics, Dark Matter is a hypothetical form of matter that is believed to make up 90 percent of the universe - it is invisible (does not absorb or emit light) and does not collide with atomic particles, but exerts gravitational force.

An international team of astronomers using the NASA/ESA Hubble Space Telescope has discovered a ring of dark matter formed long ago during a colossal collision between two galaxy clusters. This is the first time that dark matter has been found with a distribution that differs substantially from the distribution of ordinary matter. Read more here. Wiki

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