The Royal Australian Mint is taking part in the celebrations of the International Year of Astronomy with two commemorative coins issued in 2009: the one dollar coin (pictured) features the Parkes radio telescope (about which I wrote here) and the twenty cent coin is themed around community involvement with astronomy, showing stargazers looking at the starry sky.
I don't think the coins are in circulation yet, but some commemorative sets (such as this) are for sale at the Mint's online store (and in the physical store in Canberra as well, I assume).
(thanks to arthwollipot, who mentioned this in the JREF forums)
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