A scientist obtains images of a particular star, which appears as four separate stars. Which phenomenon causes the star to appear this way?

Gravitational lensing occurs when a massive object bends the path of light from a more distant star. If the light reaches us along several different paths, the star can appear as multiple images—in this case, four. Redshift changes light’s wavelength, while gravitational time dilation affects how time passes; neither creates multiple images.

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