Objects in Space (Edexcel IGCSE Physics (Modular))
Revision Note
Planets, stars & galaxies
The Universe
The Universe is defined as
A large collection of billions of galaxies
It is also the name given to the entirety of space
Galaxies
A galaxy is defined as
A large collection of billions of stars
Stars are large astronomical objects such as the Sun
The Solar System
Stars may be a part of a planetary system
In a planetary system, planets and other astronomical objects orbit around a star at the centre
Our Solar System is in the Milky Way galaxy
The Sun is at the centre of our Solar System
Our planet, the Earth, is the third of eight planets in our Solar System
Hierarchy of the Solar System
The Universe is a large collection of galaxies and a galaxy is a large collection of stars. The Sun is a star at the centre of our Solar System in the Milky Way galaxy
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