Stars, galaxies and the universe
Lesson 6 / 8
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I can describe what stars and galaxies are and explain how they look when seen from Earth.
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The Sun is a star, an extremely hot sphere of gas that emits light.
The stars in the night sky are much smaller and dimmer than the Sun because they are much further away.
A light-year is the distance light travels in one year. This is large enough to be suitable for distances in space.
In the universe, stars are found in groups called galaxies, with billions of stars in each one.
There are billions of galaxies in the universe.
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This content is by Cashar and published under an open licence.