Zoom into helix Nebula

examples of planetary Nebula.

Although the helix looks very much like a doughnut,studies have shown that it possibly to consists of
at least two separate discs with outer rings & filament.
The brighter inner disc seems to be expanding at about 100,000 km/h & to have taken about 12,000 years to have formed.
All around the inside of the ring are small blobs known as "cometary knots", with faint tails extending away from the Central star.Although they look tiny,
each knot is about as large as our solar system.
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