Australian Capital Territory becomes the first Australian territory to legalize same-sex marriage while the Government of Australia launches a legal challenge in the High Court.
A magnitude 5.8 earthquake strikes the Alpine National Park in Victoria, Australia, with tremors felt throughout the state and in parts of New South Wales, the Australian Capital Territory, South Australia and Tasmania. Some buildings in Melbourne are damaged but no casualties are reported.
Facebook bans Australian news publishers from posting and Australian users from viewing and sharing news content in a preemptive retaliation move against the Australian Competition & Consumer Commission's (ACCC) proposed News Media Bargaining Code, which would require Facebook to pay to host Australian news content. A number of key government and charity organisations were also blocked for several hours.
The High Court of Australia finds that a group of 157 Sri Lankan asylum seekers were legally detained by Australian authorities at sea. The government acted lawfully and the group is not entitled to damages.
Thousands of people gather in Canberra, Australia to protest the introduction of a carbon tax, Prime Minister Julia Gillard met the Australian Youth Climate Coalition which is pushing for a price on emissions, while climate change mitigation activists including the Australian Council of Trade Unions delivered a petition to Minister for Climate Change and Energy Efficiency Greg Combet signed by about 10,000 "working Australians" urging the government to take action.