Yes, the Sun has a surface known as the photosphere. The photosphere is the visible outer layer of the Sun that emits light and heat. It is the part of the Sun that we see when we look at it, appearing as a bright, glowing disk.
No, the Sun cannot become a planet. The Sun is a star, specifically a G-type main-sequence star, commonly referred to as a yellow dwarf. It is primarily composed of hydrogen and helium, undergoing nuclear fusion in its core to release energy. Planets, on the other hand, are celestial bodies that orbit stars, including our own planet Earth. The Sun is much larger and more massive than any planet, and its internal processes and characteristics are fundamentally different from those of a planet.
Our Sun has always been a star. It formed approximately 4.6 billion years ago from a massive cloud of gas and dust called a molecular cloud. Over time, the gravitational forces acting on this cloud caused it to collapse and form the Sun at its center. The Sun's energy is primarily produced through the fusion of hydrogen nuclei into helium in its core, a process that has been ongoing since its formation. The Sun will continue to shine for several billion years before undergoing changes that will eventually lead to its evolution into a red giant and, ultimately, a white dwarf.