Two Galaxies Are Currently Separated by 55 Mpc

question 78

Multiple Choice

Two galaxies are currently separated by 55 Mpc.Roughly how long did it take for them to reach this separation?

• A) 13.7 billion years
• B) 250 million years
• C) 4.6 billion years
• D) less than a second
• E) 27 billion years

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Definitions:

Absolute Zero

The lowest possible temperature where nothing could be colder and no heat energy remains in a substance, equivalent to -273.15°C or zero kelvin.

Publisher Type Score

A scoring metric or system that is proprietary to the publisher of a particular test, often used in educational and psychological assessments.

Standard Score

A standard score is a statistical measure that indicates how many standard deviations an entity is from the mean of the population.

SAT

A standardized test widely used for college admissions in the United States, assessing reading, writing, and math skills.