The following lists events that happened during 1957 in Australia. Incumbents Monarch – Elizabeth II Governor-General – Sir William Slim Prime Minister – Robert Menzies Chief Justice – Sir Owen Dixon State Premiers Premier of New South Wales – Joseph Cahill Premier of South Australia – Thomas Playford IV Premier of Queensland – Vince Gair (until 12 August), then Frank Nicklin Premier of Tasmania – Robert Cosgrove Premier of Western Australia – Albert Hawke Premier of Victoria – Henry Bolte State Governors Governor of New South Wales – Sir John Northcott (until 3 July), then Sir Eric Woodward (from 1 August) Governor of Queensland – Sir John Lavarack (until 4 December) Governor of South Australia – Sir Robert George Governor of Tasmania – Sir Ronald Cross, 1st Baronet Governor of Victoria – Sir Dallas Brooks Governor of Western Australia – Sir Charles Gairdner Events 19 January – The last edition of The Argus newspaper is published. 29 July – The Bega bombing occurs in Bega, New South Wales when Senior Constable Kenneth Desmond Coussens (31), his wife Elizabeth (34) and 7-month-old son Bruce are instantly killed by a bomb placed on their home's veranda. The house was demolished by the explosion at about 2 AM. 8-year-old Roger McCampbell, Coussens step-son, survived. A six-gallon metal cream container filled with 240 sticks of gelignite, stolen from a mine, was placed there by Myron Bertram Kelly. Coussens dealt with Kelly regarding traffic offences and issued him several traffic fines. Kelly appears to have become angered because Coussens issued further fines and defect notices regarding Kelly's tractor and rotary hoe. On 6 December 1957 Justice McClemens sentenced Kelly to life imprisonment for the 3 murders. 15 September – Hobart has its wettest day on record with 156.2 millimetres as a result of a slow-moving low pressure system redeveloping over the Tasman Sea 3 October – Australian National Airways (ANA) is merged with Ansett to form Ansett-ANA. Slim Dusty wins his first gold record for A Pub With No Beer. Science and technology The CSIRO develop radar and microwave navigation systems for aircraft. Arts and literature Architect Jørn Utzon wins the design competition for the Sydney Opera House Ivor Hele wins the Archibald Prize with his Self Portrait Elwynn Lynn wins the Blake Prize for Religious Art with his work Betrayal Voss by Patrick White wins the inaugural Miles Franklin Literary Award Film Robbery Under