Interestingly, the human eye can see only around 3,000-4,000 stars, even in the best "seeing" locations.
The Hubble Space Telescope saw 3,000+ GALAXIES, each with 'billions and billions' of stars--when it was pointed at an 'empty' patch of sky and allowed to gaze for several hours. The size of the patch of sky was roughly 1/140 of the size of the full moon. The resulting "Hubble Deep Field" is below.
Virtually everything you see there is a galaxy. The 'hard points' or objects with spikes are foreground stars. Anything that looks the least bit 'fuzzy' is a galaxy.
--Boris