- A space telescope captured images of star clusters that contains billions of stars
- Galaxies often contain hundreds of billions of stars
- Therefore, the star cluster that captured by the space telescope is a galaxy

Hence, the star cluster that captured by the space telescope is a galaxy
Q: In 2004 the Hubble space telescope captured images of distant star clusters, each containing about a million stars. These star clusters were most likely part of which structure?
Context:
- A space telescope captured images of star clusters that contains billions of stars 
- Galaxies often contain hundreds of billions of stars