There are trillions of Galaxies in our Universe. Every Galaxy in our Universe contains a trillion of Stars. Each Star in every Galaxy is surrounded by one (or) more rocky bodies revolving around them. These rocky bodies are generally known as Planets. These planets revolve around the star in an elliptical path. Each planet has a specified time according to its distance from the star. Our Star which is at the center is named as Sun. Presently, There are eight planets which revolve around our Sun. So, Our planetary system with the Sun is called as Solar System. In other planetary systems, There may be any number of planets around the other stars in our Galaxy. Some are habitable and some are not. As the distance of the planets increases from there respective stars, These planets experience a decrease in the temperatures on their surface.
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