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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Absolute zero is the absence of heat energy, so simply put, the opposite of nothing is something. Any value of heat would be the opposite of absolute zero. Now, if you're talking extremes, which I imagine was your angle, then I'd say our universe is the opposite.