Astronomers study stellar nurseries in molecular clouds to understand the lifespans of stars.
With reference to the diagram above, describe the physical processes involved as a star forms from a nebula and becomes stable. Compare the subsequent stages of life and final remnants of a star with a mass similar to the Sun (1 M⊙1\,M_{\odot}1M⊙) with those of a star with a mass much greater than the Sun (e.g., 20 M⊙20\,M_{\odot}20M⊙).
Spectroscopic observations of light emitted from distant galactic clusters show characteristic shifts in their emission spectra.
Define the term 'red-shift' in the context of these cosmic observations.
Explain how the observed relationship between the distance to a galactic cluster and its recessional speed supports the theory that the universe expanded from a single point (the Big Bang theory).
Explain why scientific models concerning the universe's origin and expansion are continually revised or replaced over time.
Solar system; stability of orbital motions; satellites (physics only) Questions
Practise AQA GCSE Physics Solar system; stability of orbital motions; satellites (physics only) with exam-style questions for Foundation and Higher tier. 27 questions covering Our solar system, The life cycle of a star, and Orbital motion, natural and artificial satellites, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.