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What is the Cosmos made of?

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Since the universe was very dense and hot in the early moments following the Big Bang, the universe itself was a wonderful particle accelerator. Cosmologists speculate that the dark matter may be made of particles produced shortly after the Big Bang. read more

The cosmos, and our understanding of the reasons for its existence and significance, are studied in cosmology, which is a very broad term covering any scientific, religious, or philosophical contemplation of the cosmos and its nature, or reasons for existing. read more

We found a Universe with hot dark matter didn't look anything like a real Universe . It made a certain amount of sense. Neutrinos are dark, ghostly particles that barely interact with anything else. The researchers suggested that the combined mass of all the neutrinos in the Universe might account for the missing mass. There was one issue. Neutrinos are "hot dark matter", meaning they are light and therefore able to move fast. read more

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