Astronomy Notes

Part 9: The Sun

Dr. John P. Pratt
Updated 7 Sep 2004

General Characteristics

The Sun's structure

The Sun's Energy

Kirchhoff's Laws of Radiation

  1. A solid, liquid, or high pressure gas emits a continuous spectruml.
  2. A hot, low-pressure gas has an emission spectrum, meaning it has a few bright lines.
  3. Light passing throught a cool, low-pressure gas has an absorbtion spectrum, meaning there are dark lines missing from the spectrum, where light has been absorbed.

The Solar Spectrum

Sun Spots