Astronomers Initially Had Difficulty Identifying the Emission Lines in Quasar

question 57

Multiple Choice

Astronomers initially had difficulty identifying the emission lines in quasar spectra at optical wavelengths because

• A) the emission lines were smeared out by the extremely high speed of the quasars, making them hard to measure.
• B) the emission lines were from ionized atoms that had not been seen before.
• C) the emission lines were found to be created from elements that do not exist on Earth.
• D) no one expected to see the pattern of spectral lines characteristic of the ultraviolet hydrogen spectra in the visible region.

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Definitions:

Snail Shells

Hard, protective external skeletons built by snails, offering shelter and defense against predators, composed mainly of calcium carbonate.

Genetic Traits

Inherited characteristics determined by the genetic information a person receives from their parents.

Cell

The basic structural, functional, and biological unit of all living organisms, acting as the building block of life.

Extinction Rates

The rate at which species disappear from Earth, often accelerated by human activities, leading to biodiversity loss.