What kind of stars been discovered?

Astronomers have discovered a wide variety of stars, including main sequence stars like our Sun, red giants, and supergiants. Additionally, they have identified exotic types such as neutron stars, which are remnants of supernova explosions, and white dwarfs, the remnants of low to medium mass stars. Variable stars, which change brightness over time, and binary systems, where two stars orbit each other, have also been extensively studied. These discoveries enhance our understanding of stellar evolution and the dynamics of the universe.