Interstellar mass

Definition

Interstellar mass is the total amount of gas, dust, and other matter found in the space between stars within a galaxy. It plays a crucial role in star formation and the overall dynamics of galaxies.

5 Must Know Facts For Your Next Test

1. Interstellar mass consists mainly of hydrogen and helium, with traces of heavier elements.
2. The density of interstellar mass is extremely low, often less than one atom per cubic centimeter.
3. Interstellar dust grains are typically composed of silicates, carbon compounds, and ice.
4. Regions with higher concentrations of interstellar mass can collapse to form new stars.
5. Interstellar mass absorbs and scatters light, affecting the visibility of celestial objects.

Review Questions

• What are the primary components of interstellar mass?
• How does interstellar mass contribute to star formation?
• Why does interstellar mass affect the visibility of celestial objects?

Related terms

Nebula:

A cloud of gas and dust in space, often forming regions where new stars are born.

Molecular Cloud:

A type of nebula with dense concentrations of gas and dust where molecules form and new stars can develop.

Interstellar Medium:

The matter that exists in the space between stars within a galaxy, including both gas and dust.