The Sun doesn't have anything comparable to rivers on Earth. There are some interesting flows of matter, such as solar prominences, but not of them is permanent or semi-permanent, so it would be misleading to label them as "rivers".
There are no rivers on the sun. But the sun is a gigantic ball of plasma, which is a fluid, like liquid water. There are currents of plasma moving around on the sun, and they also flow "down" below the surface in addition to "welling up" from below. There are clear records of plasma waves on the surface, just like waves on the surface of a pond. Except they are waves of rippling plasma several miles high. In general, a river as we know it is bounded. The sun is effectively a big ball of "liquid" and has multiple currents of plasma in motion all the time. Sorta like the ocean. A link can be found below.
There are no rivers on the sun. Any information suggesting otherwise is likely a misunderstanding or misinformation. The sun is a giant ball of gas made mostly of hydrogen and helium, with no solid surface for rivers to form on.
Sun spots on. Flares on and above. Solar wind above.
Scientists were able to prove that the Sun rotates by observing the movement of sun spots over time.
Some features found on the surface of the sun include sunspots, which are temporary darker spots caused by magnetic activity, solar flares, which are sudden brightening events releasing energy, and prominences, which are huge arcs of gas that erupt from the surface. Additionally, the photosphere, chromosphere, and corona are distinct layers of the sun's atmosphere visible from the surface.
None. The surface of the sun is not conducive to life.
The surface temperature of the sun is about 10,000 degrees Fahrenheit.
Capella is about 90 times larger in surface area than the sun.
The loops of gas found on the sun are called solar prominences. They are large, bright features that extend out from the sun's surface into its outer atmosphere, known as the corona, and are typically associated with the sun's magnetic field.
The sun
The surface of the moon is rocky and barren, with impact craters and dust, while the surface of the sun is a hot plasma that emits light and heat. The moon reflects light from the sun, while the sun generates its light through nuclear fusion in its core.
On the surface of the Sun, or its photosphere, you can find sunspots and granules. Sunspots are cooler, darker areas caused by magnetic activity, while granules are small, bright features resulting from convection currents in the Sun's plasma. Both phenomena contribute to the dynamic and ever-changing appearance of the Sun's surface.