7 Solar System

7 Solar System【What is the Universe?】Dialogue with the Universe

○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.<You Tube [3]>

1. Wikipedia:Solar System
2. Wikipediaスノーボールアース
3. You Tube:The helical model - our Galaxy is a vortex