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You will need a transit visa and to re-check your luggage as your stay exceeds 8 hours:
Transit visa. This visa lets people be in Australia for up to 72 hours before they must leave Australia.
(Source)
You can leave the airport:
Any citizens who need to leave the airport transit lounge while passing through will need a valid Australia visa type. Travelers on an Australia transit visa are allowed to leave the airport and stay in Australia for up to 72 hours before traveling onto their next destination.
(Source)