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Seyfert galaxies appear similar to normal spirals with extremely luminous cores.
Q16: It is possible for a medium-mass star
Q22: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TBX9273/.jpg" alt=" In the
Q38: Why is the Cepheid's period related to
Q43: Which period of Mars's planetary history was
Q44: A normal white dwarf is approximately the
Q46: Neutron stars radiate most of their energy
Q68: How have scientists been able to determine
Q69: A planetary nebula is visible due to
Q72: An astronomer named _ used globular clusters
Q74: What is an accretion disk?