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Conceptual models also range in terms of the scope of the subject matter that they are taken to represent. A model may, for instance, represent a single thing (e.g. the Statue of Liberty), whole classes of things (e.g. the electron), and even very vast domains of subject matter such as the physical universe.
This iterative process confirms the integrity of the previous block, all the way back to the initial block, which is known as the genesis block (Block 0). [28] [29] To assure the integrity of a block and the data contained in it, the block is usually digitally signed. [30] Sometimes separate blocks can be produced concurrently, creating a ...
The model is based on general relativity and on simplifying assumptions such as the homogeneity and isotropy of space. A version of the model with a cosmological constant (Lambda) and cold dark matter, known as the Lambda-CDM model, is the simplest model that provides a reasonably good account of various observations about the universe.