Major objective of this lecture is to present on Outer Layers of Sun. Outer Layers includes: Photosphere: Helioseismology and Sun spots; Chromosphere; Corona; Prominences, flares, coronal mass ejections. Photosphere – the 5800 K layer we see. Chromosphere – a thin layer, a few 1000 km thick, at a temperature of about 10,000 K. Can be seen during solar eclipse. Corona – Outermost layer, 1,000,000 km thick, at a temperature of about 1,000,000 K.