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What is the long, steady part of a star's life called, when nuclear reactions in its core power it?

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  1. The nebula stage
  2. The main sequence
  3. The supernova stage

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References

  1. NASA Imagine the Universe: Stars imagine.gsfc.nasa.gov/science/objects/stars1.html Checked 2026-10-10.
  2. CAP Aerospace Dimensions Module 5, Space Environment (Alaska Wing copy) akwg.cap.gov/media/cms/Module_5__Space_Environment_C640727DEF762_83c5b.pdf Checked 2026-10-10.

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