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Correct Answer: A) Anaxagoras.
Correct Answer: C) 1 Billion.
Correct Answer: D) Liquid water.
Correct Answer: B) Cosmic radiation.
Correct Answer: A) From more dense to less dense.
Correct Answer: B) Red orange yellow green blue indigo violet.
Correct Answer: A) A star composed of hydrogen and helium.
Correct Answer: B) Expanding.
Correct Answer: D) Denser and hotter.
Correct Answer: B) Star size.
Correct Answer: C) 4.3 years.
Correct Answer: B) Closed Universe.
Correct Answer: B) A small planet composed mainly of rocky material.
Correct Answer: D) Jupiter.
Correct Answer: D) The Sun way closer to Earth than any other star.
Correct Answer: B) Nebula.
Correct Answer: B) 68%.
Correct Answer: A) Light years.
Correct Answer: C) Microscope.
Correct Answer: D) The universe is older than our Solar System.
Correct Answer: C) Earth's gravity.
Correct Answer: D) Star.
Correct Answer: D) Galaxy.
Correct Answer: A) Energy that travels through space very quickly.
Correct Answer: D) Big bang theory.