HOW BIG
DiscoverNebulae

Nebulae

Helix Nebula: size, dimension and comparison

The adopted reference is about 2.5368 light-years.

approximate extent

A light-year is a distance: how far light travels in one year. It is used for distances between stars.

An envelope of gas ejected by a star late in its evolution.

Explore at this scale
Helix Nebula, interpreted illustration
Interpreted illustration · dimension stated in the fact sheet.

What does this number measure?

An envelope of gas expelled by a star late in its evolution. The Helix Nebula is called a planetary nebula for historical reasons; it is not a planet. Its central star ejected matter, creating an extended, diffuse structure.

Compare the stated dimensions

The comparison uses the number in each fact sheet: altitude, height, diameter, length or distance, depending on the reference. Two values in metres do not necessarily describe the same property.

Compare with Butterfly Nebula · NGC 6302 in the explorer →

Source and limitations

Catalogue order of magnitude; a source is provided, but this measurement has not been individually audited.

Helix Nebula: interpreted shells and knots in emission colours; approximate diffuse boundaries.

Illustration sources

How Big — generated illustration; NASA/ESA documentary references.

Source coverage: Interpreted reconstruction; brightness, colours and textures are not an observation. Only the designated dimension uses the catalogue's representative value.

How Big — generated illustration; NASA/ESA documentary references.

Source coverage: Interpreted reconstruction; brightness, colours and textures are not an observation. Only the designated dimension uses the catalogue's representative value.

How Big — generated illustration; NASA/ESA documentary references.

Source coverage: Interpreted reconstruction; brightness, colours and textures are not an observation. Only the designated dimension uses the catalogue's representative value.