Where must the silicate and carbon dust particles observed in nebulae have formed?
Answer
Within the dense, outflowing atmospheres of evolved, cool supergiant stars.
The required density for condensation is extremely high ($10^9$ times greater than in typical nebulae), indicating that dust must form in the dense outflow before being expelled into the lower-density interstellar space.
Related Questions
What two elements constitute the overwhelming majority of any given nebula?Why are regions undergoing star formation frequently termed 'star nurseries'?What specific class of stellar remnant is responsible for seeding the interstellar medium with elements heavier than iron?What is the approximate upper limit for elements fused and expelled by stars that eventually form planetary nebulae?What percentage of the mass of the interstellar medium is typically accounted for by interstellar dust?Where must the silicate and carbon dust particles observed in nebulae have formed?In the coldest, darkest nebular regions classified as Molecular Clouds, what state is hydrogen primarily found in?What condition characterizes hydrogen in H II Regions, and what is required to sustain this state?How does the presence of dust grains impact the measurable abundance of certain elements in the gas phase of dense clouds?What observational technique utilizes narrow filters to isolate light emitted by specific atomic transitions, revealing the distribution of trace elements?