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Correct Answer: C) Luminosity.
Correct Answer: B) Big Bang Theory.
Correct Answer: D) Black hole.
Correct Answer: A) Red shift.
Correct Answer: D) All of these options.
Correct Answer: A) On one of the outer arms of the galaxy (near the edge).
Correct Answer: C) Gravity.
Correct Answer: D) Shifted toward the red end of the spectrum.
Correct Answer: A) Nebula.
Correct Answer: D) Land, ocean and plants.
Correct Answer: C) Asteroid.
Correct Answer: C) Stars, galaxies.
Correct Answer: C) Galaxy.
Correct Answer: D) People who study the stars.
Correct Answer: D) Helium, hydrogen, lithium.
Correct Answer: B) Gravity.
Correct Answer: A) Protostars.
Correct Answer: A) A cloud of gas and dust where new stars form.
Correct Answer: D) All of the above are pieces of evidence.
Correct Answer: C) Comet.
Correct Answer: B) Solar system.
Correct Answer: B) Uniform.
Correct Answer: A) Gravity.
Correct Answer: D) Day.
Correct Answer: D) It was rapidly expanding and very hot.