Multiple choice The temperature of the sun's outer surface is <span style="font-family:" arial;="" font-size:="" small;="">7200°C°C 6000°C <span style="font-family:" arial;="" font-size:="" small;="">5600°C <span style="font-family:" arial;="" font-size:="" small;="">4800°C Reveal answer Fill a bubble to check yourself B Correct answer Explanation The Sun's photosphere (visible surface) has a temperature of approximately 5,500°C or 5,778 K. Option B (6000°C) is the closest approximation given. The other options are either too low or too high. This is standard astronomical data about our Sun.