The Distance to the Nearest Large Spiral Galaxy, the Andromeda

question 14

Multiple Choice

The distance to the nearest large spiral galaxy, the Andromeda galaxy, is 2.4 *10²² m. How long does it take light to travel from Andromeda to us?

• A) 4.4 years
• B) 360 years
• C) 1.2 thousand years
• D) 2.5 million years
• E) 4.5 billion years

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Definitions:

Serotonin

A neurotransmitter that contributes to feelings of well-being and happiness.

Black Widow Spider

A venomous spider known for the female's distinctive black color and red hourglass-shaped mark on its abdomen.

Acetylcholine

A neurotransmitter important for learning and memory, also involved in muscle activation.

GABA

Gamma-aminobutyric acid, a neurotransmitter in the brain that plays a key role in reducing neuronal excitability and is involved in regulating anxiety.