Distinguish between astronomical unit and light year.
"It is difficult to express the distance in terms of meter and kilometer between the bodies in the universe" Justify it.
What is heliocentric theory? How is it different from geocentric theory?
What are the three units used to express the distance in the universe? Write their values too.
Define light year. Calculate its value in terms of meter and kilometer.
Write some words about the evolution of the universe on the basis of "Big Bang Theory".
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