Definition of photosphere
1 : a sphere of light or radiance
2 : the luminous surface layer of the sun or a star
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Recent Examples of photosphere from the Web
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But just a few hundred miles above the photosphere, in the star's corona, the temperature suddenly jumps to several million degrees.
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The visible surface of the sun, the photosphere, has a temperature of about 6,000 degrees Fahrenheit.
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The photosphere has a temperature of between 4,500 and 6,000 degrees Kelvin, while the corona's temperatures are more like 1,000,000 or 2,000,000 K and can blaze as hot as 20,000,000 K in the right conditions.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'photosphere.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of photosphere
1664
Learn More about photosphere
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See words that rhyme with photosphere Britannica.com: Encyclopedia article about photosphere
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