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Correct Answer: A) Stars began doing fusion.
Correct Answer: C) 75% hydrogen and 25% helium.
Correct Answer: D) Appear more red.
Correct Answer: A) 13.7 billion years ago.
Correct Answer: B) Temperature and brightness.
Correct Answer: A) 13.8 billion years ago.
Correct Answer: B) Photons.
Correct Answer: B) Galileo.
Correct Answer: B) Evidence.
Correct Answer: D) Center.
Correct Answer: B) Jupiter.
Correct Answer: B) Nuclear fusion in massive, ancient stars.
Correct Answer: C) 1543.
Correct Answer: B) Jupiter, Saturn, Uranus and Neptune.
Correct Answer: C) They will fly away in straight lines.
Correct Answer: C) 3K.
Correct Answer: B) Universe.
Correct Answer: B) Hubble's Law.
Correct Answer: B) Moving away from us.
Correct Answer: A) In its core.
Correct Answer: A) Hydrogen and Helium.
Correct Answer: B) Red Shift.
Correct Answer: B) Red shift, colors of the rainbow, CMB.
Correct Answer: B) Redder.
Correct Answer: D) The formation of the universe.