Ultraviolet light (UV) from newborn stars stimulates the remaining hydrogen in the cloud to emit light at the hydrogen-alpha (Hα) wavelength of 656.28 nanometers, creating a glowing emission nebula.

A: Dark matter is called “dark” because it doesn’t give off or interact with light — including through scattering. It is simply the nature of dark matter and why it is so difficult to study.

In general, it is best to use dark text on light colors for long passages.” 2. “An important aspect of color on the Web for both low vision and colorblind users is sufficient contrast between ...

Dark matter doesn't interact with light and can't be seen through telescopes. ... We call this light the cosmic microwave background, ... Orion constellation glows red in gorgeous deep space photo. 2.

As mentioned, the final images on both the dark and light backgrounds are composites of several images that use different parts of the bottle / box which looked the best in each frame.