What features of the sun look like huge cloud-like arches?

The features of the sun that resemble huge cloud-like arches are called solar prominences. These are large, bright structures that extend outwards from the sun's surface, often looping back down due to the sun's magnetic field. Composed of hot plasma, they can appear in various shapes and sizes, sometimes towering thousands of kilometers into space. Prominences are often observed during solar flares or eruptions, contributing to the dynamic nature of the sun's atmosphere.