The word galaxy is derived from the greek word for milk, and hence our Galaxy is named the Milky Way system. Group of stars are called galaxies. Our star, the Sun, belongs to a system called The Milky Way Galaxy. The Milky Way can be seen as a band of stars in the night sky….
There’s really no definitive answer to this question. No one has counted all the stars in the night sky, and astronomers use different numbers as theoretical estimates. The number of stars you see in the night sky depends on several variables, including your location’s light pollution and your own vision. In large, light-polluted cities, only a few dozen of the brightest stars may be visible – though that doesn’t mean there’s nothing to observe from a city. But in a clear, dark sky, a couple thousand stars become visible to the unaided eye. The sheer size of space makes it impossible to accurately predict just how many stars we have. Right now, scientists and astronomers use the number of stars only within our galaxy, The Milky Way, to estimate.