Question

Why do scientists not expect to find galaxies with large blue shifts based on the Big Bang theory? A) Galaxies with large blue shifts are common, indicating a different cosmic model. B) The Big Bang theory predicts that galaxies should always have red shifts. C) Galaxies with large blue shifts have already been discovered, contradicting the theory. D) Blue shifts are unrelated to the expansion of the universe.

Answer 1

Based on the Big Bang theory, all galaxies are moving away from a common point which results in a redshift in their light. Hence, scientists do not expect to find galaxies with large blue shifts – indicating movement towards us - as it would contradict the theory.

Step-by-step explanation:

Scientists do not expect to find galaxies with large blue shifts based on the Big Bang theory because a blue shift would indicate that a galaxy is moving towards us, while the Big Bang theory inherently assumes all galaxies are moving away from a single starting point. This concept is embedded in the redshift phenomena, which is the light frequency change observed in celestial bodies moving away from us. This change appears red to us, thus the name redshift. As galaxies move farther away, light's wavelength traveling to us gets stretched, causing it to shift towards the red end of the spectrum. Hence, a galaxy with a large blue shift would imply it is moving closer to us, contradicting the Big Bang theory.

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