Why Is It Difficult for "Weightless" Astronauts in Space to Know

question 24

Multiple Choice

Why is it difficult for "weightless" astronauts in space to know whether they are right side up or upside down?

• A)The direction in which they are traveling changes rapidly.
• B)Sunrise and sunset are no longer linked to a 24 hour day.
• C)They can't see a horizon.
• D)Maculae that report head position depend upon the gravitational pull on the otoliths.

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Definitions:

Bleach

A chemical compound used for whitening or disinfecting, often comprised of sodium hypochlorite.

Outer Canthus

The external corner of the eye where the upper and lower eyelids meet.

Lower Conjunctival Sac

The space between the lower eyelid and the surface of the eye, often where eye drops are applied.

Protective Mechanisms

Biological or behavioral adaptations that help organisms survive by defending against threats or reducing harm.