How Might the Mass of a Disk Galaxy Be Found

question 110

Multiple Choice

How might the mass of a disk galaxy be found?

• A) by the double galaxy method
• B) by the rotation curve method
• C) by the cluster method
• D) by the main-sequence fitting method

---

Definitions:

Extinctions

refer to the complete disappearance of a species from Earth, often caused by environmental changes, human activities, or other factors.

Genetic Diversity

The total number of genetic characteristics in the genetic makeup of a species, it serves as a way for populations to adapt to changing environments.

Adaptive Trait

A genetically inherited characteristic that enhances an organism’s ability to survive and reproduce in its environment.

Phenotypes

The set of observable characteristics or traits of an organism resulting from the interaction of its genotype with the environment.