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What critical event transforms a protostar into a normal main-sequence star?
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Q20: How does convection in the core of
Q38: An H II region signals the presence
Q74: A low-mass star that burns helium in
Q78: As a main-sequence star burns its core
Q80: What is the difference between a Seyfert
Q82: When combined, asteroids in the asteroid belt
Q85: The net effect of the proton-proton chain
Q87: Where have astronomers observed the existence of
Q94: You see a galaxy in which