How Many Stars Are There?

The video explores the vastness of the universe, starting with the number of stars visible from Earth, which is about 5,000. It then delves into the Milky Way, estimating over 200 million stars, potentially up to 400 million. The discussion expands to the observable universe, with estimates of 100 billion to a trillion galaxies, each containing countless stars. The video emphasizes the incomprehensible scale of the universe, suggesting the number of stars may be infinite.

What are the implications of estimating the number of stars to be greater than the grains of sand on Earth?

Discuss the concept of the observable universe and its limitations.