Yes, nearly every galaxy in the universe contains numerous stars, including their own version of a "sun." Stars are the primary sources of energy in galaxies, including our own Milky Way galaxy.
Galaxies are vast systems of stars, gas, dust, and other celestial objects held together by gravity. The stars within galaxies, much like our Sun, derive their energy through a process called nuclear fusion. In the cores of stars, the intense heat and pressure cause hydrogen atoms to fuse together, forming helium and releasing a tremendous amount of energy in the process. This energy is what powers the stars, including our Sun, and allows them to shine.
However, it's important to note that not every object within a galaxy is a star. Galaxies also contain other sources of energy, such as gas clouds, dust, and supermassive black holes at their centers. Gas clouds can emit radiation and undergo gravitational collapse to form new stars, contributing to the overall energy of the galaxy. Additionally, supermassive black holes are believed to play a crucial role in the energy output of galaxies. As matter falls into a black hole, it releases a tremendous amount of energy in the form of radiation, which can impact the dynamics and evolution of the galaxy as a whole.
So, while stars are the primary sources of energy within galaxies, there are other astrophysical processes and objects that contribute to the overall energy budget of a galaxy.