７ Solar System【What is the Universe？】Dialogue with the Universe
・The solar system is considered to be located about 25,000 〜28,000 light years away 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 226 million years.
Source: Solar system-Wikipedia
・The solar activity has increased by 0.25% on the past 300 years.