'The Oort cloud & its inner region, this belt, are thought to contain billions of comets'
the Kuiper belt
STARDUST: The Oort cloud & its inner region, this belt, are thought to contain billions of comets
The Oort cloud & its inner region, this belt, are thought to contain billions of comets
The Oort cloud & its inner region, this belt, are thought to contain billions of comets
STARDUST
the Kuiper belt
STARDUST