Nebula

Definition

A nebula is a vast cloud of gas and dust in space, often serving as a stellar nursery where new stars are born. They can be remnants of dead or dying stars or regions where star formation is actively occurring.

5 Must Know Facts For Your Next Test

1. 1. Nebulae are primarily composed of hydrogen, helium, and trace amounts of heavier elements.
2. 2. There are several types of nebulae, including emission nebulae, reflection nebulae, and dark nebulae.
3. 3. Emission nebulae glow due to ionized gases emitting light at various wavelengths.
4. 4. Reflection nebulae do not emit their own light but reflect the light from nearby stars.
5. 5. The density and temperature within a nebula can vary greatly, influencing star formation processes.

Review Questions

• What are the primary components of a nebula?
• Describe the differences between emission and reflection nebulae.
• How do varying conditions within a nebula affect star formation?

Related terms

Interstellar Medium: The matter that exists in the space between stars within a galaxy, composed of gas and dust.

Protostar: An early stage in the formation of a star, where gas and dust collapse under gravity but nuclear fusion has not yet begun.

Supernova Remnant: The structure resulting from the explosion of a star in a supernova, often forming complex and beautiful nebulae.