Question 20. What is called a cluster of millions of stars, shining white in the starry sky? (a) Stars (b) Planets (c) Milky Way galaxy (d) Satellites Answer .
A huge collections of stars, dust and gas are known as galaxies. They contain several million of stars and their size can range from few thousands to several hundred thousands light years. They have different shapes and brightness and can be found alone, in pairs or in clusters. The galaxy of Earth is called Milky Way.
