When an Astronomer Measures the Redshift to a Distant Galaxy

question 36

Essay

When an astronomer measures the redshift to a distant galaxy, exactly what physical process is being measured?

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Definitions:

Operating System

The program that controls hardware resources and offers services to computer applications.

Flash Drive

A portable storage device that uses flash memory and can be connected to a computer through a USB port.

Executable File

A type of computer file that, when opened, instructs the operating system to perform specific actions or run a program.

Nonvolatile

Referring to a type of computer memory that retains data even when the power is turned off.