The large chrome-colored balls began washing up at Forrest Beach, a small coastal community about 80 km north of Townsville, on the afternoon of July 3.
Queensland Fire Department crews recovered a total of six by July 5, the Australian Broadcasting Corporation reported.
Responders sealed off a 50-meter exclusion zone and shut part of the beach. Teams in protective suits placed the spheres in hazmat drums under police guard over fears they held hazardous chemicals.
The fire department told anyone who found a suspicious object not to touch it, to move away and to call the Triple Zero (000) emergency line, warning that more could surface in the days ahead.
The Australian Space Agency said on July 6 that the objects appeared to be pressure vessels from a space launch vehicle, and that their location and characteristics matched debris from a foreign rocket body that recently re-entered the atmosphere from orbit.
