The Spectrum of a Star Shows a Set of Dark

question 58

Multiple Choice

The spectrum of a star shows a set of dark absorption lines equivalent to the absorption lines of the Sun but with one exception: Every line appears at a slightly longer wavelength, shifted toward the red end of the spectrum. What conclusion can be drawn from this observation?

• A) A cloud of cold gas and dust surrounds the star and is absorbing light from it.
• B) The star is moving toward Earth.
• C) The temperature of the star's surface is higher than that of the Sun.
• D) The star is moving away from Earth.

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Definitions:

Good Things

Positive or favorable events, outcomes, or aspects of one's life that contribute to their well-being and happiness.

Low Arousal

A state characterized by calmness and a lack of high energy or excitement.

Pleasant Emotion

Feelings that are enjoyable or pleasing, such as happiness, joy, or contentment.

Hedonic Treadmill

A theory proposing that people stay at about the same level of happiness regardless of what happens to them.