The universe is a vast space.
It holds lots of Galaxies. Galaxies have lots of stars. These are a few types of stars:

                                                                       Red Giant

                                                                        White Dwarf

                                                                         neutron star
                                       

                                          When a star dies it may become a black hole.
                                          Black holes have a lot of gravity, so they suck everything in their path.

This is a space cloud which is known as a nebula.