Gravitational Pull

Gravitational Pull

David Kerkhoff

Design date:
Publisher: Hanoded

My 9-year old son Sam asks a lot (a LOT!) of questions. Like: ‘what killed the dinosaurs?’ (probably an asteroid), ‘what is the distance to Pluto’ (about 7.5 billion km), ‘how big is space’ (93 billion lightyears – give or take). I am pretty sure he…

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