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In the proton-proton chain,how many protons are required to make a helium nucleus?
Q2: Discuss the Jesuits and their role in
Q5: What accounts for the seasonal changes in
Q7: François de La Rochefoucauld wrote _ that
Q13: A collision of two large spiral galaxies
Q14: What property of a star can almost
Q14: What are spicules?<br>A)Jets of gas shooting upward
Q22: The hottest stars have spectral class<br>A)O<br>B)A<br>C)G<br>D)M
Q23: The images transmitted by one of the
Q25: The radiation emitted by the sun is
Q25: What can escape from within the Schwarzschild