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In the formula E=mc2, the letter c stands for
Q5: A friend (who does not have the
Q15: Which of the following is evidence for
Q16: In 1911 Ernest Rutherford did a famous
Q21: What is one way that we humans
Q23: Which of the following statements about our
Q29: When stars become giants, which of the
Q35: If no one has ever visited the
Q35: When the mass of a star's core
Q36: Which of the following stages will the
Q42: The same gas makes up most of