In the Eighteenth Century,Sir William Herschel Used Star Counts in Regions

question 77

Multiple Choice

In the eighteenth century,Sir William Herschel used star counts in regions of the sky along the Milky Way to estimate the position of the center of the Galaxy.He incorrectly concluded that the Sun was close to the Galaxy's center.The reason for this erroneous conclusion was that

• A) Herschel counted all stars in each star field,including many that were outside our Galaxy,thus confusing the distribution.
• B) the redshift of the more distant stars made them invisible to Herschel.
• C) he had no knowledge of the large quantity of dust between stars,which obscured the more distant regions of the Galaxy.
• D) he mistook globular clusters for stars,and those are distributed uniformly around the Sun.

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Definitions:

Sleep Deprivation

A condition resulting from a lack of adequate sleep, which can affect cognitive functions, mood, and overall health.

Catch Up

Refers to the process of trying to reach the same level or standard as someone or something else, often after a period of lagging behind.

Sleepiness Decreases

A reduction in the feeling of being tired or the need for sleep, often resulting from rest or specific interventions.

Concentration

The ability to direct one's attention or mental effort on a specific task or object while minimizing distractions.