Answer: Gas and dust
Explanation:
- The material responsible for filling the space between the stars is known as interstellar medium.
- These regions consist of gas and dust and have very low density.
- The interstellar gas consists of hydrogen and helium.
- The dust particles have an irregular shape, and are made of carbon,silicates, ice, and iron compounds.
- The dust particles are extremely small, their size is in microns.
Thus, the interstellar medium is not a complete vacuum but consists of gas and dust.
