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Astronomical Unit


An astronomical unit (AU) is a unit of distance used in astronomy to describe the average distance between the Earth and the Sun. It equals about 149.6 million kilometers (or about 93 million miles). The AU is useful for measuring distances within our solar system, such as the distance from Earth to other planets. For example, Mars is about 1.5 AU from the Sun. Using the AU makes it easier to understand and compare distances between planets without dealing with very large numbers. The symbol for astronomical unit is "AU".


Sun’s Radius


The radius of the Sun is the distance from its center to its surface (photosphere).



  • It is approximately 696,340 kilometers (about 432,685 miles).



  • The Sun is a nearly perfect sphere of hot plasma, and this radius defines its visible "surface."



  • The Sun’s radius is about 109 times the radius of Earth.



Key facts:



  • Sun’s radius ≈ 696,340 km



  • Defines the size of the Sun’s visible surface



  • Critical for understanding solar structure and scale



Knowing the Sun’s radius helps astronomers model solar phenomena and compare the Sun with other stars.




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