NGC 1052-DF2

DF2 · Sparse stars and a dark-matter puzzle

The route uses the approximately 72-million-light-year distance reported by the 2021 Hubble study. Revising the distance matters because it changes the inferred size, luminosity and mass.

The moving dashes represent light travelling between galaxies. Their speed and the spacing of the galaxy icons are illustrative.

A diffuse stellar body

This tile illustrates how spread-out starlight allows background objects to remain visible. It is not a diameter comparison or a measurement of transparency. No single sharp outer boundary is assigned to this diffuse galaxy here.

Loose starlight, compact clusters

Stars are distributed through a very faint extended body, with compact globular clusters standing out against it. The model separates diffuse stellar light and clusters; it does not depict dark matter, which is inferred from gravitational effects.

Select Stars or Clusters to highlight the diffuse body and compact stellar systems. Pulsing is illustrative.

An unusual gravitational puzzle

Measurements of stellar and cluster motions have been interpreted as evidence for unusually little dark matter. The inferred amount depends on distance, dynamical assumptions and limited tracers, so the dossier does not treat “no dark matter” as a directly observed fact.