Volume: Counting Stars

The video explores how astronomers estimate the number of stars in the universe, comparing it to counting grains of sand. It explains the process of calculating the volume of a beach to estimate sand grains and applies a similar method to estimate stars in galaxies. The universe is vast, with around 100 billion stars in our galaxy and up to 400 billion galaxies, suggesting over 40,000 million million million stars. This is ten times more than the grains of sand on Earth, though exact numbers are unknown.

What is the estimated number of stars in our galaxy?

How does the estimated number of stars in the universe compare to the grains of sand on Earth?