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What is the reason a type I supernova slows its dimming after about 2 months?
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Q45: What are at least three possible explanations
Q58: Quasar's spectral lines are:<br>A) emission lines with
Q77: As a star evolves,heavier elements tend to
Q78: The final core collapse of a massive
Q84: The shell ejection in making a planetary
Q88: Whose work with SETI led to the
Q100: A cold region of dust which scatters