Suppose an Astronomer Living on a Planet in a Galaxy

question 38

Multiple Choice

Suppose an astronomer living on a planet in a galaxy of the Perseus cluster (distance = 300 Mpc) looked back at our Milky Way galaxy.If she measured the hydrogen line H alpha (rest wavelength 6500 A) ,what wavelength would she actually measure? (H = 70 km/s/Mpc)

• A)6955 A
• B)6500 A
• C)5850 A
• D)6200 A
• E)6600 A

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Definitions:

Face-To-Face Interaction

Direct social interaction between individuals in close physical proximity.

Societies

Groups of individuals living together within structured communities that share customs, laws, and organizations.

Coordination

The act of organizing or aligning elements in a system or process to work together efficiently towards a common goal.

Literate Workforce

A population of workers proficient in reading and writing, often tied to improved productivity and economic outcomes for a country.