Orbit Questions

• How can there be anything left in the universe? Don't black holes suck everything in?
• Is Pluto a planet?
• What keeps the North Star stuck at exactly North?
• Why are all the stars fixed in space?
• Why did people believe the earth is the center of the solar system when it's obvious the sun is?
• Why does everything in our galaxy orbit the supermassive black hole at the center?
• Why doesn't the earth fall down?
• Why is the sun cold in the winter?
• Why is there no up and down in space?