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Einstein's equations required the universe to expand or contract; he could not imagine or accept it doing either one, so he put a factor cosmological constant in his equation to stop it from moving.
What is Cosmological constant?
The cosmological constant, often known as Einstein's cosmological constant, is the constant coefficient of a term that Albert Einstein briefly added to his field equations of general relativity. It is typically represented in cosmology by the Greek capital letter lambda, or. Later, he took it away. It was renewed and reinterpreted many years later as the vacuum energy that emerges in quantum mechanics. It has a tight relationship to the idea of dark energy.
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