The Sirius star is about 8.1 * 10 raise to the power of 13 km from the earth assuming that the light travels at 3.0 * 10 raise to the power of 5kilometre per second find how long light from sirius star take to reach the earth
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time =distance/speed
time=8.1×10000000000000/3.0×100000
time=2.7×100000000sec
time=2.7×100000000/3600=75000hrs
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