Giant tennis balls or fuzzy green aliens?
Maybe not, but that doesn’t make the hundreds of green balls that took up residence on an
Australian beach any less peculiar. On Thursday, the strange spongy things washed
up on the Sydney beach and appear to be the size of a tennis ball. About 6 centimetres in diameter, the squishy
little spheres are actually living organisms – they are seaweed balls known as ‘marimo’. They are thought to be a type of living green
algae that rolls around on the sea floor, forming a ball shape. The balls don’t have a core, and they have
been seen growing up to 30 centimetres in diameter. It’s been said the balls actually make fantastic
pets, since they own need light for photosynthesis and clean water to thrive.