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Q1: Why is luminosity an inverse-square law?
Q10: No known galaxy has its spectra lines
Q20: The Hubble classification for a very flat
Q24: What is a metamorphic facies?<br>A)A rock that
Q24: In the Hubble classification scheme,the four main
Q38: X-ray flares coming from Sagittarius A* dramatically
Q42: Two stars have the same spectral classification,say
Q55: By analyzing a star's spectra,the chemical composition,the
Q108: How do massive protostars (4 solar masses)evolve
Q111: Why is iron the last element produced