○The Solar System is located in the Orion Arm, 26,000 light-years from the center of the Milky Way (100,000 light years in diameter).
○There are 200 billion stars in the Milky Way galaxy.
○The solar system is orbiting in the galaxy at a speed of 220km / s, for about one orbiting of the galaxy about 225-250 million years. [1]
○Revolution speed of the Earth is 30km per second.
○The brightness of the sun was only about 70% of the current in 4.6 billion years ago when the solar system was born, that has been increasing the brightness gradually thereafter.
○The sun continues to increase the brightness at a rate of 1% in about 100 million years now. [2]
Zooming out the Solar System [1]
○The earth revolves in Milky Way Galaxy while drawing a spiral.：The helical model＜You Tube [3]＞
【References】
1. Wikipedia：Solar System
2. Wikipedia：スノーボールアース
3. The helical model - our solar system is a vortex
https://www.youtube.com/watch?v=0jHsq36_NTU
【Change log】
20170727 Addition of The helical model
20180908 Organizing figures.
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