The Sun
The Sun's photosphere has a temperature between 4500 and 6000 K (with an effective temperature of 5777 K) and a density of about 2×10−4 kg/m3; other stars may have hotter or cooler photospheres. The Sun's photosphere is composed of convection cells called granules—cells of gas each approximately 1000 kilometers in diameter with hot rising gas in the center and cooler gas falling in the narrow spaces between them. Each granule has a lifespan of only about eight minutes, resulting in a continually shifting "boiling" pattern. Grouping the typical granules are super granules up to 30,000 kilometers in diameter with lifespans of up to 24 hours. These details are too fine to see on other stars.
Read more about this topic: Photosphere
Famous quotes containing the word sun:
“Behold, O God our shield, and look upon the face of thine anointed.
For a day in thy courts is better than a thousand. I had rather be a doorkeeper in the house of my God, than to dwell in the tents of wickedness.
For the Lord God is a sun and shield: the Lord will give grace and glory:”
—Bible: Hebrew Psalm LXXXIV (l. LXXXIV, 9–11)
“And as the sun above the light doth bring,
Though we behold it in the air below,
So from th’ eternal Light the soul doth spring,
Though in the body she her powers do show.”
—Sir John Davies (1569–1626)