MOST Supernova Remnants Can Be Observed Only at Nonvisible Wavelengths

question 90

Multiple Choice

MOST supernova remnants can be observed only at nonvisible wavelengths. Explain.

• A) Supernova remnants are too cool to produce radiation at visible wavelengths.
• B) Supernova remnants are too hot to produce radiation at visible wavelengths.
• C) Visible wavelengths are produced by supernova remnants but they are blocked by the interstellar medium.
• D) All the visible wavelengths are Doppler shifted to infrared because all the supernova remnants are moving away from Earth at high speeds.

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Definitions:

Fontanelles

Soft spots on a baby's skull where the bones have not yet fused, allowing for growth of the brain and skull.

Cephalocaudal

denotes a pattern of growth in humans where development proceeds from the head downwards through the body, guiding both physical growth and motor skill development.

Proximodistal

A pattern of development where growth starts at the center of the body and moves towards the extremities.

Proximodistal

Describes the pattern of development that proceeds from the center or core of the body outwards towards the extremities.