The universe is made up of galaxies, usually found in groups known as galaxy clusters. Our galaxy is called the Milky Way.

Galaxies consist of huge clouds of dust and gases called nebulae, and of stars, such as the Sun.

• Stars are made up mainly of hydrogen and helium.
• Many stars have planets revolving around them forming planetary systems.
• Stars that are very close to each other are called open clusters.

 Structure of universe map 

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Constellations are groups of stars that seem to form a particular shape when observed from Earth. They are important both in terms of astronomy and mythology.

One example of a constellation is Ursa Major, or the Great Bear. Its seven brightest stars form the ‘Plough'.

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