Correction for the weight of an American Football
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How heavy is 400,000,000 tonnes?
It's about 950,000,000,000 times as heavy as an American Football
The weight of an American Football is about 0.0004110680853125 tonnes.
(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 0.00039689332375 tonnes and 0.000425242846875 tonnes. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.