It is those thousands of stars grouped together that form the galaxies you can see with a telescope.
Stars are the objects that heat and light the planets in a system.
Everything revolves around stars. Thousands of stars cover our galaxy and when you look at our star, the Sun, you will see it is quite small. Throughout the universe there are big ones, small ones and different colored ones. We're going to discuss the way scientists study stars and how stars affect the planets that orbit them. Assuming you aren't in a city with tons of smog or clouds, you will probably see a sky filled with little dots of light.