Universe FinderFly · Explore · Discover
Hubble · Ring Nebula
Hubble · Ring Nebula · NASA, ESA, and C. Robert O’Dell (Vanderbilt University)

Ring Nebula

Nebula in Lyra · 2,300 light-years

🔭 Explore Ring Nebula in the 3D map →View Ring Nebula images →

The Ring Nebula, Messier 57, is not a flat ring. It is the glowing material shed by a dying star, seen almost along its axis: observations model the bright ionized region as barrel-like and a thin molecular envelope around it as a truncated ellipsoid viewed nearly pole-on.

TypeNebula
ConstellationLyra
Right ascension18h 53m 06s
Declination+33° 02′
Object distance2,300 light-years
Also known asM57
Imaged byJWST, Hubble
The Ring Nebula is a deep shell of gas seen almost pole-on, with a bright ionized region and a thin molecular envelope around it—not a flat ring.

Observing Ring Nebula

Ring Nebula lies in the constellation Lyra and is best placed in the evening sky around July. Its maximum altitude above the horizon depends on your latitude. It is best placed for observers in the northern hemisphere, and sits low for those far south. Note that the listed magnitude is spread across the whole object — diffuse galaxies and nebulae are often harder to see than the number alone suggests, so dark, moonless skies help a great deal.

Why a deep shell looks like a ring

The familiar image is a projection. Hubble-era imaging and spectroscopy describe the bright ionized gas as a barrel-like region with lower-density material extending through the centre. Newer carbon-monoxide observations trace a different layer: a thin molecular envelope around the ionized gas, modelled as a truncated ellipsoid viewed almost pole-on.

These are scientific reconstructions rather than a photographed surface. Universe Finder therefore labels the side view as a visualization and distinguishes the bright inner region from the surrounding molecular layer instead of treating either model as a literal three-dimensional photograph.

The exposed core and expanding layers

The bright ring is roughly a light-year across, while a much fainter halo reaches several times farther. The material is still expanding, and its age depends on which layer and model is measured: the bright ionized shell and the surrounding molecular envelope give different dynamical estimates.

At the centre is the exposed stellar core, extremely hot and already cooling toward a white dwarf. Evolutionary models indicate that the original star was somewhat heavier than the Sun. The Ring Nebula is therefore the Sun's kind of ending, but it is not a preview with identical mass or timing.

What Webb revealed in the shell

Webb's infrared images resolve an immense population of dense molecular-hydrogen knots. Their total is an estimate produced by two counting approaches, not a census of individually confirmed objects across an unobscured surface.

Outside the main ring, a sequence of faint arcs may record the influence of a close companion star. That companion is inferred from the arc spacing and has not been directly detected. A much wider red-dwarf companion shares the central star's motion, so combining the measured wide companion with the inferred inner one makes the system likely, rather than certainly, triple.

How to find Ring Nebula tonight

Begin with Vega and find the small parallelogram that outlines Lyra. The Ring Nebula lies about halfway between Sheliak and Sulafat, the two southern stars of that parallelogram.

Binoculars may show only a faint point. A telescope is needed to resolve the smoke-ring appearance, and light pollution, haze, moonlight and local conditions can make the target harder to see.

For a location-aware view, open the Tonight panel in Universe Finder. Find in my sky shows the current direction from your location; Show in 3D returns to the catalogue flight.

The numbers — and how sure we are

Every value below carries its label from the episode research pack: MEASURED (observation-derived), ESTIMATE (model-derived or uncertain), COMPARISON (an analogy for scale), VISUALIZATION (explanatory rendering).

Questions people ask

Is the Ring Nebula really a ring?

No. The round appearance is a projection produced by looking almost along the structure's axis. Observations model the bright ionized region as barrel-like and the surrounding thin molecular layer as a truncated ellipsoid. Both descriptions are model reconstructions of different layers, not a photographed solid surface.

What is at the centre of the Ring Nebula?

The faint central point is the exposed core of the star that expelled the nebula. It is extremely hot and cooling toward a white dwarf. Models indicate the original star was somewhat heavier than the Sun, so comparisons to the Sun describe a broadly similar evolutionary ending rather than an identical future object.

How far away is Messier 57?

The Gaia parallax of its central star places the Ring Nebula at about twenty-five hundred light-years away. Because of that travel time, the light arriving now shows the nebula as it was roughly twenty-six centuries ago.

Did Webb discover a companion star inside the Ring Nebula?

No close companion has been directly detected. Astronomers infer that one may exist because of the spacing of faint arcs outside the main ring. A separate, much wider red-dwarf companion does share the central star's motion; combining it with the inferred inner companion makes the system likely triple.

How can I find the Ring Nebula tonight?

Find Vega and Lyra's small parallelogram, then look about halfway between Sheliak and Sulafat. A telescope is needed to resolve the ring. Universe Finder's Tonight panel can calculate visibility for your location, Find in my sky can show the direction, and Show in 3D returns to the flight.

See Ring Nebula in Universe Finder

Open the interactive 3D map to fly to Ring Nebula and see it in context among the real stars around it. Launch the 3D view →

Prefer to watch first? Watch the full Ring Nebula episode — a guided 3D flight with chapters, transcript and sources →

Sources

Related objects