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NASA is preparing to launch the most powerful space telescope ever. What will it see?
In the 1970s, Hawking proposed that dark matter, the invisible substance that makes up most matter in the cosmos, may be made of black holes formed in the earliest moments of the Big Bang. Now, three astronomers have developed a theory that explains not only the existence of dark matter, but also the appearance of the largest black holes in the universe.
An anti-universe running backwards in time could explain dark matter and cosmic inflation.
Scientists suspect that a “fifth force” may be at work in space. This force, which they believe is mediated by a hypothetical particle called a symmetron is responsible for creating invisible walls in space.
