M110

NGC 205 · Andromeda’s diffuse companion

M110 is about 2.7 million light-years from Earth. The light we receive began crossing intergalactic space roughly 2.7 million years ago; the rounded figure is not its distance from Andromeda.

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

≈ 17,000 light-years across.

A rounded 17,000-light-year stellar extent follows the SEDS Local Group catalog. Faint outskirts fade gradually into the background, so a quoted diameter depends on the measurement convention.

The overview compares this galaxy with a rounded Milky Way reference of 100,000 light-years on one linear scale. These luminous extents do not represent sharp physical edges.

Smooth light with hidden detail

M110 looks like a smooth, elongated ellipse, but closer observations reveal dust clouds and a population of young blue stars near the center. The model highlights its central region and outer stellar envelope; neither forms a spiral disk.

Select Core or Envelope to highlight the central concentration and outer starlight. Pulsing is illustrative, not a physical change in brightness.

Andromeda’s wider family

M110 is a satellite of Andromeda and a member of the Local Group. It contrasts with compact M32: its light is spread over a more diffuse elongated body. The companion study illustrates this neighborhood rather than exact spatial coordinates.