Edexcel IGCSE Physics: Double Science

Revision Notes

8.1.1 Objects in Space

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Planets, Stars & Galaxies

  • The Universe is a large collection of billions of galaxies
    • It is also the name given to the entirety of space

  • A galaxy is a large collection of billions of stars
    • Stars are astronomical objects such as the Sun

  • These stars are part of Solar systems
    • Our Solar system is in the Milky Way galaxy

  • Each Solar system has a number of planets
    • Our planet, the Earth, is the third of eight planets in our Solar System
    • The Sun is at the centre of our Solar System

Objects in Space 1, downloadable IGCSE & GCSE Physics revision notesObjects in Space 2, downloadable IGCSE & GCSE Physics revision notesObjects in Space 3, downloadable IGCSE & GCSE Physics revision notes

Hierarchy of the solar system

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