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

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Definitions:

Null Hypothesis

A statistical hypothesis that assumes no significant difference or effect exists between certain datasets or conditions.

Independent Variable

A variable in an experiment that is manipulated to observe its effect on the dependent variable.

Dependent Variable

A variable in an experimental setup that is observed and expected to change in response to manipulations in the independent variable.

Random Error

Variability in data that arises from unpredictable fluctuations and cannot be attributed to any specific cause, affecting the precision of measurements.