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Which star spends the longest time as a main-sequence star?
Q9: If the wavelength of the background
Q13: The nucleus of the typical comet is
Q13: A surprising fact about a 1
Q18: If a galaxy has a recessional
Q46: While traveling the galaxy in a
Q70: Open star clusters primarily inhabit which part
Q70: Why is hydrogen burning the main energy
Q72: The minimum size of a meteoroid that
Q79: If neutrinos oscillated between five different types
Q85: If you measure the velocity of a