Earth, Sun and Moon
Occupation: Astrophysicist, Author, TV presenter
Year born: 1934
Research Areas: Extraterrestrial Life, Planetary Science
Occupation: Mathematician, Astronomer
Year born: 1868
Research Areas: The Sun, Sunspots, Magnetic Storms
The visible surface of the Sun is called the photosphere. Sunspots are darker, cooler regions on the bright, hot photosphere. Whilst the photosphere has a temperature of around 6000°C, sunspots are between 3000°C and 4000°C.