The exact number of solar systems is not known. According to NASA, there are more than 100 billion galaxies within the universe. One of these galaxies is the Milky Way galaxy, where our solar system is located.
A galaxy is made up of billions of stars, some of which have their own solar systems. Considering that the billions of galaxies potentially have solar systems, the number of solar systems borders on the infinite. NASA indicates that studies by various astronomers have barely scraped the surface and new discoveries about the universe continue to be made. As of 2014, astronomers have discovered about 1,700 planets outside the ordinary solar system.