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Kritika Trehan 7 years, 11 months ago
An operating system (OS) is system software that managescomputer hardware and software resources and provides common services for computer programs. All computer programs, excluding firmware, require an operating system to function.
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Batch operating system
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Time-sharing operating systems
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Time-sharing operating systems
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Network operating System
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Real Time operating System
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Kritika Trehan 7 years, 11 months ago
The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today.
Because current instruments don't allow astronomers to peer back at the universe's birth, much of what we understand about the Big Bang Theory comes from mathematical formulas and models. Astronomers can, however, see the "echo" of the expansion through a phenomenon known as the cosmic microwave background.
While the majority of the astronomical community accepts the theory, there are some theorists who have alternative explanations besides the Big Bang — such as eternal inflation or an oscillating universe.
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