What is the visible surface of the Sun called?

chromosphere
corona
stratosphere
photosphere
The photosphere is a layer below which the Sun becomes opaque to visible light. It is tens to hundreds of kilometers thick, and is slightly less opaque than air on Earth. Because the upper part of the photosphere is cooler than the lower part, an image of the Sun appears brighter in the center than on the edge or limb of the solar disk, in a phenomenon known as limb darkening.
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chromosphere
corona
stratosphere
photosphere
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flagLebanon
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14%
0%
85%
14
flagIndia
14%
28%
9%
47%
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flagCanada
13%
20%
20%
46%
15
flagFrance
27%
27%
0%
45%
11
flagRepublic of Ireland
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33%
8%
41%
12
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33%
8%
41%
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38%
14%
8%
38%
360
flagAustria
33%
23%
5%
37%
51
flagPoland
18%
37%
9%
34%
5040
flagthe United States
14%
22%
28%
34%
163
flagAustralia
25%
31%
8%
34%
35
flagthe United Kingdom
12%
42%
11%
33%
80
flagSwitzerland
33%
18%
15%
33%
33
flagthe Philippines
30%
26%
13%
30%
23
flagSpain
40%
30%
0%
30%
10
flagGreece
42%
14%
14%
28%
14