Interstellar dust

Definition

Interstellar dust consists of tiny solid particles found in the space between stars, within galaxies. It absorbs and scatters starlight, affecting astronomical observations.

5 Must Know Facts For Your Next Test

1. Interstellar dust grains are typically composed of silicates, carbon, ice, and other elements.
2. Interstellar dust contributes to the extinction and reddening of starlight as it passes through space.
3. Dust particles can range in size from a few nanometers to a few micrometers.
4. The presence of interstellar dust is crucial for the formation of molecules and stars in molecular clouds.
5. Infrared astronomy is often used to study interstellar dust because these wavelengths can penetrate the dust clouds.

Review Questions

• What are the primary components of interstellar dust?
• How does interstellar dust affect the light from stars?
• Why is infrared astronomy particularly useful for studying interstellar dust?

Related terms

Interstellar Medium:

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

Molecular Clouds:

Dense regions within the interstellar medium where new stars are born.

Extinction:

The absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.