The observable universe is estimated to contain about 2 trillion galaxies , though some older estimates put the figure closer to 100–200 billion. The exact number is uncertain because many faint, distant galaxies are too hard to detect directly.

Quick Scoop

Astronomers used deep-sky surveys and extrapolated from the galaxies we can actually see to estimate the total. More recent work pushed the estimate upward, while some later discussions suggest the lower-end counts may still be relevant depending on how “galaxy” is defined and what can be observed.

Why the number varies

  • Some studies count only galaxies bright enough for current telescopes to detect well.
  • Others correct for tiny, dim, or distant galaxies that are likely missing from observations.
  • That is why you will see ranges like 100–200 billion or around 2 trillion in reputable sources.

In one line

A solid modern estimate is roughly 2 trillion galaxies in the observable universe.