Astronomers observe light from a distant galaxy and notice that its spectral lines are shifted toward longer wavelengths (redshifted). What conclusion can be drawn about the galaxy from this observation?

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• A The galaxy is moving directly toward Earth, and the universe is contracting.
• B The galaxy is moving away from Earth, and the universe is expanding.
• C The galaxy is burning out its hydrogen fuel and cooling down.
• D The galaxy is rotating faster and generating stronger gravitational forces.

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