Which one of the following is a reason why astronomical distances are measured in light-years?
Options
(a)Distances among stellar bodies do not change.
(b)Gravity of stellar bodies does not change.
(c)Light always travel in straight line.
(d)Speed of light is always same.
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Class 11The Origin and Evolution of the Earth— NCERT Geography, Chapter 2. Early theories explained only the earth and planets: the nebular hypothesis of Kant, revised by Laplace (1796) and again by Otto Schmidt and Carl Weizsäcker (1950), had…
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