The cosmological constant was proposed 100 years ago in order to make the model of static Universe, imagined then by most scientists, possible. Today it is the main candidate for the physical essence causing the observed accelerated expansion of our Universe. But, as well as a hundred years ago, its nature is unknown. This paper is devoted to the story of invention of Λ by Albert Einstein in 1917, rejection of it by him in 1931 and returning of it into the great science by other scientists during the century. The aim is to once again emphasize prominent role of cosmological constant in the development of ideas of modern physics and cosmology, focusing on the main points and publications, the choice of which may have a certain part of subjectivity.

中文翻译：

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Λ的世纪

宇宙常数是在100年前提出的，目的是使大多数科学家当时想象的静态宇宙模型成为可能。今天，它已成为导致我们宇宙加速扩展的物理本质的主要候选者。但是，以及一百年前，它的性质是未知的。本文致力于1917年阿尔伯特·爱因斯坦（Albert Einstein）发明Λ的故事，1931年他拒绝了Λ的发明，并在本世纪其他科学家将其归还给伟大的科学。目的是再次强调宇宙学常数在现代物理学和宇宙学思想发展中的突出作用，重点是要点和出版物，它们的选择可能具有一定的主观性。