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Star-forming emission nebula · evidence and sources

Lagoon Nebula

Also known as M8, Messier 8, NGC 6523.

Catalog Position basis, the same label the app shows on the selection card.

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Every aspect, with its origin

One record per aspect. The origin says what kind of thing each value is; the source says where it came from; the limit says what it cannot tell you.

ObservedCatalogComputedReconstructedIllustrativeUndocumented
Position Catalog

Sky position and adopted distance

Lagoon Nebula is placed at J2000 RA 18.1 h, Dec -24.4° in Sagittarius, at an adopted distance of 4,100 light-years.

EpochJ2000
LimitThe long axis and named cores follow the Earth sky plane; the full cloud depth is unknown.
Physical data Catalog

Measured dimensions

Lagoon Nebula (star-forming emission nebula; central source Herschel 36, massive multiple star system): measured footprint 100 × 50 light-years; display depth 14 light-years (not measured); outer radius used for arrival 50 light-years.

Methodmeasured sky-plane structure with constrained display depth
Appearance Reconstructed

Sky-plane structure with a display depth

The 100 × 50 light-year footprint, Herschel 36, Hourglass core, NGC 6530, and half-light-year twisters follow published observations. The depth of the larger molecular cloud is not measured here, so the thin display volume is explicitly reconstructed.

Methodmeasured sky-plane structure with constrained display depth
LimitEmission points and knots are deterministic presentation samples, not individually catalogued gas parcels.

What is not measured

  • Appearance: a reconstruction from measurements, not a direct observation. Sky-plane structure with a display depth. Emission points and knots are deterministic presentation samples, not individually catalogued gas parcels.

Sources cited

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