Quote by Dr. Carl Sagan
A galaxy is composed of gas and dust and stars - -billions upon billions of stars
Summary
This quote emphasizes the immense scale and complexity of galaxies. It implies that galaxies consist of various elements like gas, dust, and an incredibly vast number of stars. By stating that there are billions upon billions of stars in a galaxy, it underscores the sheer number and magnitude of celestial bodies within this astronomical structure. This quote illustrates the vastness and wonder of the universe through the description of galaxies and their constituents.