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CAIE IGCSE Physics 6.2.2.3 Star Life Cycle a Forms From Questions

Learn how gravity forms a protostar and how inward gravity balances outward pressure in a stable star.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • describe gas and dust collapsing under gravity to form a hotter protostar
  • explain stable-star balance between inward gravity and outward pressure
  • link increasing core temperature and pressure to the onset of stable fusion

CAIE IGCSE Physics 6.2.2.3 Star Life Cycle a Forms From Questions question 1

[Maximum number: 5]

The Sun is one of many billions of stars in the Milky Way. The Sun emits a very large quantity of energy as electromagnetic radiation.

Question (a)

(a)

Approximately 4.6 billion years ago, the Sun formed from an interstellar cloud of gas and became a stable star.

[ 5 ]

Question (i)

(i)

Describe and explain what happens as an interstellar cloud of gas forms a protostar.

[ 2 ]

Question (ii)

(ii)

Describe and explain what happens as a protostar becomes a stable star.

[ 3 ]
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