This is NGC 2005. It's a bright star cluster - a globular cluster - and a bit unusual. The chemical composition of NGC 2005's stars is different from the stars in the Large Magellanic Cloud (LMC), the Milky Way's largest satellite galaxy. 

 

This suggests that the LMC merged with another galaxy in its past. This other galaxy merged and dispersed long ago, but NGC 2005 remains an ancient witness to this merger.

 

Globular clusters are large and dense, containing thousands to millions of stars, all formed from a common nebula. These clusters are stable and harbor the oldest stars in galaxies, so they are an excellent laboratory for studying galaxy evolution.

Image description:

 

The globular cluster looks like a dense, ball-shaped collection of many bright stars in white, yellow-orange and blue colors. Some stars appear slightly larger and brighter than others, while the brightest ones have faint cross-shaped diffraction spikes. The stars in the cluster are mostly evenly distributed, with their density increasing towards the cluster's core, where they produce a strong, bright white glow.

Isn't it interesting how two galaxies merge? Will our galaxy merge with another galaxy one day?