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A Dark-Disk Universe JiJi Fan, Andrey Katz, Lisa Randall, and Matthew Reece Department of Physics, Harvard University, Cambridge, MA, 02138 We point out that current constraints on dark matter imply only that the majority of dark matter is cold and collisionless. A subdominant fraction of dark matter could have much stronger interactions. The biosphere is the global sum of all ecosystems. It can also be termed as the zone of life on Earth, a closed system (apart from solar and cosmic radiation and heat from the interior of the Earth), and largely self-regulating. The idea that the universe is a giant cellular automaton is the strong ver-sion of the statement that the universe is a computer. That is, not only does the universe compute, and only compute, but also if one looks at the ‘guts’ of the universe – the structure of matter at its smallest scale – then those Universe definition is - the whole body of things and phenomena observed or postulated : cosmos: such as. How to use universe in a sentence. Dvali would modify the theory of gravity so that the universe becomes self-accelerating, eliminating the need for dark energy. Prentice Hall Pearson Prentice Hall and our other respected imprints provide educational materials, technologies, assessments and related services across the secondary curriculum. Take a closer look at the instructional resources we offer for secondary school classrooms.