The Milky Way contains between 200 and 400 billion stars and at least 100 billion planets. The exact figure depends on the number of very - low - mass stars, which are hard to detect, especially at distances of more than 300 ly (90 pc) from the Sun. As a comparison, the neighboring Andromeda Galaxy contains an estimated one trillion (10) stars. Filling the space between the stars is a disk of gas and dust called the interstellar medium. This disk has at least a comparable extent in radius to the stars, whereas the thickness of the gas layer ranges from hundreds of light years for the colder gas to thousands of light years for warmer gas.
what all is in the milky way galaxy
between 200 and 400 billion stars and at least 100 billion planets