Compared to the air we breathe, how dense is the matter within a typical nebula, such as that in Orion, where star formation is taking place?

Question

Quizplus · Accepted Answer

The matter within a typical nebula is about 10^-16 times as dense as the air we breathe. This is because nebulae are vast clouds of gas and dust that are very diffuse. The density of a nebula is typically around 10^-21 kg/m³, while the density of air at sea level is around 1.2 kg/m³.

Compared to the Air We Breathe, How Dense Is the Matter