How Many Stars Per Cubic Parsec Are There in the Spiral

question 386

Multiple Choice

How many stars per cubic parsec are there in the spiral arms of a spiral galaxy compared with the regions between the spiral arms?

• A) There are more than 100 times as many stars in the spiral arms as there are in the regions between the arms.
• B) There are about twice as many stars in the spiral arms than in the regions between the arms.
• C) There are a lot of stars in the spiral arms and none at all in the regions between the arms.
• D) There are about 5% more stars in the spiral arms than in the regions between the arms.

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Definitions:

Synovial Membrane

A specialized connective tissue that lines the inner surface of capsules of synovial joints, secreting synovial fluid for lubrication.

Cruciate Ligament

One of the major ligaments in the knee, crucial for stabilizing the joint, including both the anterior and posterior varieties.

Synovial Joint

A type of joint that is surrounded by a fluid-filled capsule, allowing for smooth movement between bones and is commonly found in the knees, elbows, and shoulders.

Fibrous Capsule

A dense layer of connective tissue that surrounds organs, such as the kidney and liver, providing protection and structural support.