It's about one-ten-thousandth as heavy as a Rhinoceros
In other words, the weight of a Rhinoceros is 11,000 times 0.000000000200 megatonnes.(for Black rhinoceros, Diceros bicornis) (Adult, male)
An adult black rhinoceros weighs between 0.00000210 megatonnes. Rhinoceros are extremely aggressive — nearly one of every two males will die as a result of fighting with other rhinoceros.
It's about one-fifteen-thousandth as heavy as The Tongue of a Blue Whale
In other words, the weight of The Tongue of a Blue Whale is 14,000 times 0.000000000200 megatonnes.(Balaenoptera musculus) (adult)
The tongue of a Blue Whale can weigh up to 0.00000270 megatonnes. Despite their tremendous size, blue whales feed almost exclusively on tiny crustaceans called krill and cannot swallow anything much larger than a beach ball.
It's about one-twenty-thousandth as heavy as a Hippopotamus
In other words, 0.000000000200 megatonnes is 0.00005330 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 18,800 times that amount.(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 0.000003750 megatonnes. Appearances to the contrary, adult hippos cannot swim or float in water; they actually move by leaping and walking across lake bottoms at about 8 kph (5 mph).
It's about one-thirty-thousandth as heavy as an Elephant
In other words, the weight of an Elephant is 30,000 times 0.000000000200 megatonnes.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 0.00000610 megatonnes. Among African elephants, both males and females have tusks (whereas female Asian elephants, Elephas maximus, do not have tusks) which can grow to 3 m (10 ft) and typically weigh about 0.00000400 megatonnes
It's about one-thirty-thousandth as heavy as a Tyrannosaurus rex
In other words, the weight of a Tyrannosaurus rex is 32,000 times 0.000000000200 megatonnes.(for FMNH PR2081, a.k.a. "Sue") (a.k.a. Tyrannosaurus, a.k.a. T-Rex) (estimated live weight)
The notable Tyrannosaurus specimen housed at the Field Museum of Natural History in Chicago, Illinois, "Sue," is estimated to have weighed about 0.00000640 megatonnes while alive. A renowned predator in popular culture, the teeth of tyrannosaurus rex were up to 33.02 cm (13 in) long.
It's about 45,000 times as heavy as a Grain of Sand
In other words, the weight of a Grain of Sand is 0.0000220 times 0.000000000200 megatonnes.(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.00000000000000440 megatonnes. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.
It's about 55,000 times as heavy as a Sesame Seed
In other words, 0.000000000200 megatonnes is 54,900 times the weight of a Sesame Seed, and the weight of a Sesame Seed is 0.00001820 times that amount.(Sesamum indicum)
A sesame seed weighs approximately 0.000000000000003640 megatonnes. The McDonald's Big Mac sandwich, which is well-known for its sesame seed top bun, accounts for the consumption of an estimated 0.000002010 megatonnes of sesame seeds each day.