8. A particular star is at a distance of about 8.1 × 10¹³ km from the earth . Assuming that the light travels at 3 × 10⁸ m / sec , find how long light takes from that star to reach the earth .
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Distance=8.1×10^13 km
=8.1×10^13×10^3m
speed=8.1×10^16m
Time= distance / speed = 8.1×10^16 / 3×10^8
=8.1/3 × 10^8
=2.7×10^8 sec
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