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An Astronomer Observes Many Galaxies in Distant Parts of the Sky

question 53

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An astronomer observes many galaxies in distant parts of the sky to have emission lines redshifted relative to the same lines seen in a laboratory.What is the most likely explanation?


Definitions:

Reliability

The consistency and dependability of a measurement, test, or assessment over time.

Validity

The extent to which a test or instrument measures what it claims to measure.

Reliability

How much a testing tool generates consistent and stable outputs over various times.

Validity

Refers to the extent to which a concept, conclusion or measurement is well-founded and likely corresponds accurately to the real world.

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