(a) How large is the Sun (diameter: 1.4×106 km) on this scale?
(b) How far away is the nearest star (distance: 4.24 light-years) on this scale?
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a) The Sun is about 109 times the diameter of the earth. The sun weighs about 333000 times of the earth. It is so large that about 1300000 planet earths can fix in it.
b) It is about 4.22 light years from earth and is the closest star other than the sun. Alpha Santauri A and B orbit a common center of gravity every 80 years. The average distance between them is about 23 astronomical units ( AU ) - a little more than the distance between the sun and the Uranus.
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