This is the sparkly dust from a passing comet. It seems to whirl around like a tiny galaxy. Perhaps if you collected enough of it, it would merge into a solid mass!
Comet Dust price in Growtopia: sells for about 2 WL, buyers pay about 1 WL (median of 1103 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: UUUSELL, Y1LP, MB3MM, HHHOI, SHOPWANGLIN