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|title=Sputnik's Guide to Life on Earth

|author=Frank Cottrell Boyce

|date=April 2016

|isbn=978-0230771376

}}

Sputnik Mellows set himself a mission – to discover whether Earth exists. Now he's found it, he needs to prove it ''should'' exist and, to do this, he enlists the help of schoolboy Prez Mellows. Together they need to find ten things that will justify Earth's existence. If they fail to do this by the end of the summer holidays, Earth will be shrunk by Planetary Clearance as part of the pan-galactic decluttering programme.