SOT • Active Region Evolution - Sunspot and Granulation - These high resolution images show a close-up view of a moderately large sunspot. The field of view covers about 30,000 km horizontally and vertically. 29.1.2021 • The penumbral diameter of this sunspot (taken on 20.8.2013) is about 16500 km; the Earth, with an equatorial radius of 6378 km, would cover up the umbra but not the penumbra. Sunspots can be quite small (~1500 km diameter), and reach sizes up to 50000 km. While it is known that