1. Photosphere: This is the visible surface of the Sun, where the light we see is emitted. It's a thin layer about 500 km deep.

2. Chromosphere: This is a thin layer above the photosphere, characterized by its reddish color due to the presence of hydrogen. It extends upwards about 2,000 km.

3. Transition Region: This is a very thin and poorly understood layer that separates the chromosphere from the corona. It's characterized by rapid temperature changes.

4. Corona: This is the outermost layer of the Sun's atmosphere, extending millions of kilometers into space. It's extremely hot and contains a very low density of plasma.

5. Heliosphere: This is the vast region of space dominated by the Sun's magnetic field and solar wind, extending far beyond the orbit of Pluto.

It's important to note that these layers are not distinct boundaries but rather gradual transitions.