1. If you could see a few stars through a dark nebula, how would you expect their spectra and… 1 answer below »

1. If you could see a few stars through a dark nebula, how would you expect their spectra and colors to differ from similar stars just in front of the dark nebula? 2. Ancient astronomers, philosophers, and poets assumed that the stars were eternal and unchanging. Is there any observation they could have made or any line of reasoning that could have led them to conclude that stars don’t live forever? 3. How does hydrostatic equilibrium relate to hot-air ballooning?  

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