An expanding cloud is observed after a massive star suddenly became much brighter. A very small, dense remnant is found at its centre. Which explanation is consistent with these observations?
A nebula contracted and left a red supergiant.
A red giant expanded and left a main sequence star.
A main sequence star formed and left a white dwarf.
A supernova ejected material and left a neutron star.
75 exam-style questions on Edexcel GCSE Physics 7.3 Stars, covering 7.3.1 Evolution of stars similar to the Sun, 7.3.2 Evolution of massive stars, and 7.3.3 Observing the Universe. Each one has a worked solution and a mark scheme showing where the marks go.