The blue-green glow in the centre of the Helix comes from oxygen atoms shining under effects of the intense ultraviolet radiation of the 120 000 degree Celsius central star and the hot gas. Further out from the star and beyond the ring of knots, the red colour from hydrogen and nitrogen is more prominent. A careful look at the central part of this object reveals not only the knots, but also many remote galaxies seen right through the thinly spread glowing gas.
Designed by Kweller
This disc is a product developed by Kweller company which was made especially for such planetariums as Uncle Milton Star Theater Pro and Nashika NA-300.
Please note that we sell 2 kinds of discs. If your planetarium is Segatoys Homestar Pro 2 / Classic / Original / Earth Theater, you should choose another disc here:
Frequently asked question
Why does it not display the entire picture?
Answer: It is OK that the picture is not displayed entirely. During rotation of the disc different parts of the picture are displayed.
Many other models
You can see all models of our discs in our catalog: