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Stars, galaxies and stellar evolution

Space physics and astrophysics · Lesson 2 of 3

Lesson 2 of 3

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Lesson 2 of 3 · Space physics and astrophysics

Stars, galaxies and stellar evolution

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By the end you’ll be able to

describe the universe as containing billions of galaxies, each containing billions of stars, and identify our Solar System as part of the Milky Way galaxy
state that a star forms from a nebula and explain that gravitational collapse leads to a protostar and then a stable main-sequence star
explain that a star remains stable for much of its life because the inward force of gravity is balanced by the outward pressure produced by fusion in its core

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explain that the change in a star over time depends mainly on its mass

interpret simple diagrams or descriptions of stellar life cycles and classify the likely end stage of a star from its initial mass

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