English National Curriculum - Science
Mission Objectives
Explain why stars become unstable
Describe the life cycle of stars of different masses
Explain how elements of different sizes are formed
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Words and meanings to learn
protostar
a young star that forms when a nebula contracts under gravity and becomes hot and dense enough for nuclear fusion to start
nebula
a huge cloud of gas and dust in space where stars are formed by the force of gravity pulling the material together
main sequence star
the long, stable stage of a star’s life when hydrogen nuclei fuse to form helium and the outward pressure from fusion balances the inward pull of gravity
supernova
a massive explosion that occurs when a very large star runs out of nuclear fuel and its core collapses, creating and scattering elements heavier than iron
neutron star
the dense core left behind after a supernova, composed almost entirely of neutrons and containing more mass than the Sun in only a few kilometres’ diameter
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