The heaviest object ever directly weighed was the Revolving Service Structure (RSS) of launch pad 39B at NASA's Kennedy Space Center, Florida, USA. The structure was lifted up on 21 jacking points which, between them, measured the mass of the RSS as 2,423 tonnes (5,342,000 lbs).
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No. Science can help uncover reality and filter out wishful thinking. The only way anyone can know anything is by checking it against reality. That’s all science is. Anything it can’t reveal can’t be known. Period.