A galaxy is a system of stars dust and gas held together by gravity.
This is a photo of a space ship that went to mars it had no people in it but the space ship had robot that takes pictures on mars.Plus there is video on google videos that you can see.It shows you how the space shuttle went into space.
This is a photo of a song that is about the galaxy and you need to go on you tube or google videos to watch it.
This is a universe with lots of galaxies and planets.
