Starship Asterisk*

I'm not so sure "accompanying links" clear the issue up, in fact I see a continuation of misunderstanding with citing Rayleigh scattering (which produces blue sky). If blue light is either scattered or reflected, we could not see the nebulae as blue. It must be the other end of the spectru...

For those who haven't seen the optical phenomenon the "second full moon in a month" might qualify as a "blue moon" but, in optics, there is a real phenomenon that actually produces a moon that is coloured blue. This phenominal blue moon is much rarer than the "calendar"...

"... M78, is just below centre in this sharp wide field view, covering an area north of Orion's belt. At a distance of about 1,500 light-years, the bluish nebula itself is about 5 light-years across. Its blue tint is due to dust preferentially reflecting the blue light of hot, young stars in th...

The APOD for June 20 2005 showing a blue setting sun in a red sky appears to be very strong evidence that the size of the dust particles in the sky of Mars includes a significant proportion at the appropriate size (about twice the wavelength of visible light) to cause Mei scattering of red wavelengt...

An atmospheric layer of particles (such as from volcanic activity or forest fires) between an observer and the moon scatters red light to leave direct light from the moon a blue colour. This is the origin of the expression "once in a blue moon" because this is a very rare occurrence. In Se...