The Andromeda nebula, M31, was a prominent example ... which captures the intensity of light from blue to red. Astronomers call a shift to longer wavelengths a redshift. It seemed that these ...
Some of his favorite subjects include the Orion Nebula (1,500 light-years away) and the Andromeda Galaxy (2.5 ... is represented as green, oxygen as blue and sulfur as red. When viewing one ...