Explain the stages in the life cycle of a star, including: the formation from interstellar gas and dust containing hydrogen, the development of a protostar from a collapsing interstellar cloud, the stabilization of a star when gravitational forces are balanced by thermal pressure, the depletion of hydrogen as fuel for nuclear reactions, the expansion of most stars into red giants or red supergiants after hydrogen is converted to helium, the formation of a planetary nebula and white dwarf from a less massive star, the supernova explosion of a red supergiant leading to a nebula with new elements, and the potential for new stars and planets to form from the supernova remnants.

Quick explanation

Explain the stages in the life cycle of a star, including: the formation from interstellar gas and dust containing hydrogen, the development of a protostar from a collapsing interstellar cloud, the stabilization of a star when gravitational forces are balanced by thermal pressure, the depletion of hydrogen as fuel for nuclear reactions, the expansion of most stars into red giants or red supergiants after hydrogen is converted to helium, the formation of a planetary nebula and white dwarf from a less massive star, the supernova explosion of a red supergiant leading to a nebula with new elements, and the potential for new stars and planets to form from the supernova remnants

• This point belongs to Stars, especially Stars outcomes.
• You need to be able to explain the stages in the life cycle of a star, including: the formation from interstellar gas and dust containing hydrogen, the development of a protostar from a collapsing interstellar cloud, the stabilization of a star when gravitational forces are balanced by thermal pressure, the depletion of hydrogen as fuel for nuclear reactions, the expansion of most stars into red giants or red supergiants after hydrogen is converted to helium, the formation of a planetary nebula and white dwarf from a less massive star, the supernova explosion of a red supergiant leading to a nebula with new elements, and the potential for new stars and planets to form from the supernova remnants.
• The key ideas to know are Describe, Explain, and Outline.
• Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.