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Why is the distance between stars expressed in light years? What do you understand by the statement that a star is eight light years away from the earth? Why is the distance between stars expressed in light years? What do you understand by the statement that a star is eight light years away from the earth?
Given:Questions:1.Why is the distance between stars expressed in light years?2.What do you understand by the statement that a star is eight light years away from the earth?Solution and answer Very big distances can not be measure in small units like meter and kmthus we have to use bigger scaleFor example:1. In your maths note book you use cm and mm 2. But length of your class can not be measured in mm ocm so we use meter or feet3.Distance of your house is measured in km not in meter4. Stars are at at very big height so we use ‘LIGHT YEAR’NOWWHAT IS LIGHT YEAR?”one light year is equal to the distance the sunlight travels in one year” One light-year = 5,878,625,370,000 miles = 9.5 x 1012 kmNow our question2:A star is eight light years away from the earth=8 x i light year=8 x9.5 x 1012 km=76 x 1012 kmSo the distance of this star from earth =76 x 1012 kmOTHER IMPORTANCE BIG DISTANCES:1 LIGHT YEAR= 63,240 AU1 AU=93 million miles (150 million km)1 AU= DISTANCE BETWEEN EARTH AND SUN Mean distance from sun to each planetMercury: 0.387 AUVenus: 0.723 AUEarth: 1.000 AUMars: 1.524 AUJupiter: 5.203 AUSaturn: 9.582 AUUranus: 19.201 AUNeptune: 30.047 ATHANKS
Mean distance from sun to each planet
Mercury: 0.387 AUVenus: 0.723 AUEarth: 1.000 AUMars: 1.524 AUJupiter: 5.203 AUSaturn: 9.582 AUUranus: 19.201 AUNeptune: 30.047 A
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