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___________ associations and ___________ associations are groups of stars born together but not gravitationally bound to one another.
Q10: If a star with an absolute magnitude
Q62: Observations from the Compton Gamma Ray Observatory
Q65: At extremely high densities and temperatures, electrons
Q69: Planetary nebulae are sites of planet formation.
Q74: Why does a helium flash occur under
Q110: The above reactions are of the _.
Q111: How long can a four-solar-mass star live<br>A)1
Q116: The figure shows an image of a
Q135: Sunspots are dark because<br>A)regions of the photosphere
Q172: Some giants and/or supergiants are less dense