Distinguish between galaxy and constellation.

Galaxy                                                         Constellation

It is a collection of stars, dust and gas.         It is a group of stars.

It does not form any particular pattern.         It forms the shape of an animal or object.

There are around 10¹¹ galaxies.                  There are only 88 constellations known so far.

Example: Milky Way                                    Example: Orion