５ Solar System #SolarSystem

５　Solar System　 #SolarSystem

○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]
<img src="http://image.space.rakuten.co.jp/d/strg/ctrl/9/540a7e29e3ca610d676854104f6b6b86a88b8e63.50.2.9.2.png" alt="Solar-System.png" border="0">
Zooming out the Solar System [1]

○The earth revolves in Milky Way Galaxy while drawing a spiral.＜You Tube [3]＞

<img src="https://image.space.rakuten.co.jp/d/strg/ctrl/9/183184ba9a4572b92d20169037ce4b8460695f48.50.2.9.2.png" border=0 />

【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