Asteroids are made of rock and metal and are found in asteroid belts. These belts orbit the sun between Mars and Jupiter. Asteroids can crash into each other which can potentially change the orbit.
Our solar system also has comets and asteroids. Comets are balls of ice and dust that orbit the sunbut differently in comparison to planets. Comets come really close to the sun and then really far away when orbiting.
The gravitational field strength (g) on earth is 10. However this varies on other planets and even earths moon. On the moon the g is 1.6.
A galaxy is a system of millions and billions of stars alongside interstellar gas and dust that is held together by gravitational attraction.
The Milky Way is approximately 100,000 light years in diameter.
The galazy we live in is called the Milky Way and it has over 200 billion stars in it and enough dust and gas to make billions more
The universe is all of space and time including planets, stars, comets, asteroids, matter and energy.
Did you that orbital speed varies based on how far a planet is from the sun. The further the planet the longer it takes for the planet to orbit the sun.