Email Print Share

All Images

Research News

Techniques to prove or disprove existence of other planets

sun filtered in blue and red

The sun imaged through filters centered on the calcium K (blue) and hydrogen alpha (red) absorption lines. While the calcium K line is traditionally used to measure a star's magnetic activity, this study used the hydrogen alpha line instead.

Credit: Copyright Alan Friedman

Download the high-resolution JPG version of the image. (1.6 MB)

Use your mouse to right-click (Mac users may need to Ctrl-click) the link above and choose the option that will save the file or target to your computer.