As an expert in the field of physics and general knowledge, I can provide an answer to your question about the heaviest thing in the world. The concept of "heaviest" can be interpreted in different ways, but if we are talking about the most massive objects in the context of astronomy and astrophysics, the answer is black holes.

Black holes are regions of spacetime where gravity is so strong that nothing, not even light, can escape from them. The most massive black holes are known as supermassive black holes, which can have masses equivalent to millions or even billions of times the mass of our Sun.

However, if we are considering the heaviest objects on Earth, we might look at the largest known solid objects, such as massive mountains or the Great Pyramid of Giza, which is the largest and heaviest of the pyramids in Giza, with an estimated mass of about 6.5 million tons.

It's important to note that the concept of "heaviest" can change depending on the context and the criteria used to define it.

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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).read more >>