The Eye In The Sky. A stellar cosmic artwork
The cosmic artwork – the eye in the sky formed as the dying stars outer layers unravelled.
The so called eye in the sky is one of the closest to earth
There are more stars in the continually expanding universe than in the number of grains of sand on Earth.
The Helix nebula – the constellation of Aquarius discovered by Karl Ludwig Harding-is closest to the Earth of all the bright planetary nebulae.
It’s the nearest example of what happens to a star, like our own Sun, as it approaches the end of its life when it runs out of fuel, expels gas outward and evolves into a much hotter, smaller and denser white dwarf star.
Some observers “dark adapted” at high altitudes and under dry sky claim to have seen the Helix without optics and filters. Binoculars or telescopes are required for detailed observation.
Rhodopsin is the photopigment used by the rods (receptors in the eye) to enable vision in low light conditions. Bright light causes these pigments to decompose. Darkness causes the molecules to regenerate, i.e. “dark adaptation.”
The eye is made up of over 200 million parts and is the second most complex organ after the brain.