Abstract
Ambartsumian published this article in Russian 75 years ago. In this work, he showed for the first time that star formation was not interrupted in the past, but continues in our cosmological time. His conclusion was that at the same time as the old stars, such as the Sun, there are also much younger ones, which are only a few tens of millions of years old. Another important conclusion was that stars are born in groups. The author called the groups of young stars stellar associations. Actually, by publishing this article, Ambartsumian established a new, so-called ”Byurakan concept” of the formation of space objects.
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