Edexcel IGCSE Physics: Double Science 复习笔记： 8.1.1 Objects in Space

• The Universe is 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 a 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

   

Hierarchy of the solar system

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