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From pic related, we can see that the boulder has a diameter approximately equal to Suisei's height, which is 160 cm.
Assuming the boulder is a sphere, we can find its volume of 2.145 m3.
If we assume the boulder is made of sandstone, we can use a density of 2323 kg/m3 (sandstone's density covers a range from 2000 to 2600), we can find the boulder's mass at 4982 kg (or 11023 lbs for burgers)
