Definition of "photosphere" []

• The visible outer layer of a star, especially of the sun. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The surface layer of the Sun that we can see is called the photosphere and has a temperature of about 5800 degrees Kelvin."
• "But compressed gas in the thicker, denser part of the Sun mashes together all those energies, spreading them out, so it emits white light (that layer of the Sun is called the photosphere)."
• "The photosphere is the surface that emits solar radiation to space."