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1896 Summer Olympics and 2004 summer Olympics.
Australia has sent athletes to every Summer Olympics since the modern games began in 1896.
Australia and New Zealand combined athletes to compete under the name Australasia in 1908 and 1912.
In modern times, the first Summer Olympics was in 1896.
Summer: 1896
Winter: 1924
Summer olympics started in 1896, winter olympics in 1964