Overview
The Solar System (太陽系, Taiyōkei) is a region in the Milky Way Galaxy consisting of the Sun, a star, and other celestial objects orbiting around it.
It consists of a staggering 200 - 400 billion stars with diameters of 80,000 - 100,000 light years, yet its stellar mass is a fraction of the total mass of the galaxy (about 1.26 trillion times the mass of the sun, most of the rest is dark matter).
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太陽系とは (タイヨウケイとは) [単語記事] - ニコニコ大百科 (NicoNico Encyclopedia)
