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The Big Bang explains why so much helium exists in the universe when it could not have been created by hydrogen fusion in stars alone.
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Q40: A typical refracting telescope is made up
Q55: Halo stars and globular clusters move in
Q60: Which of the following does NOT describe
Q60: Which of the following statements is TRUE,according
Q65: A particular galaxy has a nuclear region
Q68: Transpiration is the chemical energy process in
Q74: Who first demonstrated that light does NOT
Q82: The force of gravity between two objects
Q123: In Newton's law of universal gravitation,F =