“There are 100 billion universes.”
Usage Entry 1380 / 1605 60-second read
Universe vs. Galaxy
Everything that exists versus a single gravitationally bound system of stars.
The comparisoni
“There are 100 billion galaxies in the observable universe — galaxies are large but finite collections of stars. The universe is everything.”
The ruleii
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UNIVERSE = all. GALAXY = one cluster.
A GALAXY is one gravitationally bound system of stars (the Milky Way has 100–400 billion stars). The UNIVERSE contains all galaxies — current estimates put it at ~100 billion to 2 trillion observable galaxies.
Memory aidiii
Remember it like this
Universe contains galaxies.