Is there only one sun in the universe?

There is only one sun, but there are many celestial bodies like the sun. The sun is actually a star.

Stars are composed of non-solid, liquid and gaseous plasmas in the fourth state, and are spherical or quasi-spherical celestial bodies that can emit light by themselves. Because the stars are too far away from us, it is difficult to find their position changes in the sky without special tools and methods, so the ancients regarded them as stars, and the sun, the main star of our solar system, is a star.

The orbit of the sun:

The sun is located on the spiral arm of Orion, north of galactic plane, about 30,000 light years from the center of the Milky Way, and 26 light years north of galactic plane. On the one hand, it rotates around the center of the Milky Way at a speed of 250 kilometers per second, with a period of about 250 million years. On the other hand, it moves near Vega at a speed of 19.7 kilometers per second relative to the surrounding stars. The sun is also rotating, and its cycle is about 25 days in the equatorial belt; The polar region is about 35 days.

The sun is passing through the local bubble region of Orion's arm at the inner edge of the Milky Way. Within 0/7 light-years from the Earth/kloc-,there are 50 nearest star systems (the latest one is a red dwarf named proxima centauri, which is about 4.2 light-years away from the sun), and the mass of the sun ranks fourth among these stars.

The sun revolves around the Milky Way, 24,000 to 26,000 light-years away from its center. From a bird's eye view of the North Pole of the Milky Way, the sun rotates clockwise for about 225 million to 250 million years. Because the Milky Way moves in the direction of Ophiuchus at the speed of 550km/s in the cosmic microwave background radiation (CMB), after the two speeds are combined, the speed of the sun relative to CMB is 370km/s, which is moving in the direction of Magnus or Leo.

On 2016 65438+1October 15 local time, the Solar Dynamics Observatory of NASA released a time-delayed video with a duration of about 6 minutes, which fully showed the activity track of the sun.