Estimate the mass of gas contained in interstellar space in a volume equal to the volume of the earth.

The answer can range from 50 g to 1 kg (depending on the accepted density of the interstellar medium).

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.