This is the Web Edition of "A Trip Into Space", a Coimbra-based electronic book on space science. Both the texts and the photos are by courtesy of National Aeronautics and Space Administration.

Sun
Solar Disk In H-Alpha

This is an image of the Sun as seen in Ha which is a narrow wavelength of red light that is emitted and absorbed by the element hydrogen. (Courtesy National Solar Observatory/Sacramento Peak)

Last Update: 2004-Nov-27