In which specific types of nebulae might the amount of helium be significantly elevated compared to a standard star-forming cloud?
Answer
Planetary nebulae or supernova remnants
Nebulae associated with dying stars, such as planetary nebulae or supernova remnants, often contain significantly more helium because the stars that formed those nebulae processed much of their hydrogen into helium during their main-sequence lives.
Related Questions
Which two elements overwhelmingly dominate the elemental composition of any given nebula by mass?What is the typical percentage contribution of hydrogen to the total mass of a nebula?What is the function of hydrogen gas in a star-forming region?In a pristine nebula, where does the majority of the helium present originate from?In which specific types of nebulae might the amount of helium be significantly elevated compared to a standard star-forming cloud?While comprising only a small fraction of the mass, what key role do the trace heavier elements play in nebulae?What process involving trace gases creates the distinct colors seen in emission nebulae?When ionized, which specific element is mentioned as often emitting green or blue light?What necessity do heavier elements provide for the potential formation of terrestrial planets like Earth?How are nebulae chemically related to the Interstellar Medium (ISM)?What might a significant deviation from the expected H to He ratio in a nebula suggest to astronomers?