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- The actual model of the universe still cannot be given with any certainty. The current view is that the universe began
- from the big bang about 12 billion years ago, when it began expanding into the emptiness. (There are two alternatives
- for the expansion: closed universe or open universe, the latter being more popular.)
- In both cases there are maybe more than a billion galaxies, and in galaxies there are billions of stars, some of them
- more or less like our Sun. The more we know about our central star, the more we understand the structure of the
- universe. In this study the SOHO spacecraft has been and still is one of the most valuable instruments.
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