NASA’s Hubble and Spitzer Space Telescopes have joined forces to discover nine of the smallest, faintest, most compact galaxies ever observed in the distant universe. Blazing with the brilliance of millions of stars, each of the newly discovered galaxies is a hundred to a thousand times smaller than our Milky Way Galaxy.
The conventional model for galaxy evolution predicts that small galaxies in the early universe evolved into the massive galaxies of today by coalescing. These nine Lego-like „building block“ galaxies initially detected by Hubble likely contributed to the construction of the universe as we know it.
https://hubblesite.org/contents/news-releases/2007/news-2007-31.html
Space Telescopes Find Lego-Block Galaxies In Early Universe
8. September 2007