Which of the Following Was Used by Some Astronomers in the Early

question 19

Multiple Choice

Which of the following was used by some astronomers in the early 1900s to argue that spiral nebulae were nearby objects?

• A)Their large parallaxes
• B)Measurements taken several years apart that showed rotation
• C)Their small Doppler shifts
• D)An absence of globular clusters in spiral nebulae

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Definitions:

Prostate Gland

A gland in the male reproductive system that produces seminal fluid, which nourishes and transports sperm.

Ejaculation

The release of semen from the male reproductive system, often occurring during sexual climax.

Menstrual Cycle

The regular natural change that occurs in the female reproductive system, leading to menstruation and potential fertility.

Progesterone

A hormone produced in the ovaries, placenta, and adrenal glands that plays a key role in the menstrual cycle and maintaining the early stages of pregnancy.