What Is the Best Way to Determine a Galaxy's Redshift

question 112

Multiple Choice

What is the best way to determine a galaxy's redshift?

• A)Take a spectrum of the galaxy, and measure the difference in wavelength of spectral lines from the wavelengths of those same lines as measured in the laboratory.
• B)Measure the magnitude of the galaxy, estimate its distance, and calculate its redshift using Hubble's Law.
• C)Find the color of the galaxy, and estimate its distance based on how red the galaxy is.
• D)Find the galaxy's apparent distance, and look up the redshift based on Hubble's Law.

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Definitions:

Hardy-Weinberg Law

The Hardy-Weinberg Law is a principle that predicts the genetic variation and allele frequencies will remain constant in a population from generation to generation, assuming no evolutionary influences affect them.

Gametic Isolation

A type of reproductive barrier where gametes (sperm and egg) of different species fail to meet or fuse, preventing gene flow between the species.

Open Water

Large bodies of water such as oceans, seas, and large lakes, where there is no nearby land within sight.

Gametes

Mature haploid sex cells, such as sperm and eggs, that unite to form a diploid zygote during sexual reproduction.