Childrens Literature: A novel about a small boy on other planets?

Questions

What is the name of the seaport of Perth, Western Australia?

An English translation is "Wind and Water". How do we know the more common original?

Which Planet is 2872 million kilometres from the Sun and has an orbital time of 84 years?

Whose recent biography is entitled "Life in the Jungle"?

Who was the last Danish king of England?