why this universe is expanding
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the universe+ 4 dimensions began because of big bang . the explosion was so big the gas is spreading today at great speed
fedr:
the four d = depth,width,length and time
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The universe starts frrom big bang theory . In first trillionth of a second the temperature of the universe was ten billion trillion trillion degree Celsius because of which the universe is expanding at the speed of 70km per sec.
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