Why was the moon only half known for a long time? Detailed answer

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Why was the moon only half known for a long time? Detailed answer

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Why was the moon only half known for a long time?

For a long time, the study of the Moon was limited only to telescopic observations. One astronomer said that the lunar surface is a book from which one can read its history. Such a "book" does exist, but until 1959 about half of its pages were inaccessible to humans.

The fact is that the Moon, completing one complete revolution around the Earth in about 28 Earth days, manages to make only one revolution around its own axis in the same time, moreover, in the same direction. Therefore, the same part of the lunar ball is facing the Earth.

In 1959, the Soviet automatic station Luna-3 photographed the invisible side of the lunar surface for the first time. To date, the invisible hemisphere of the Moon has been photographed many times, even its detailed maps have been compiled.

Author: Cellarius E.Yu.

Random interesting fact from the Great Encyclopedia:

Where does the word miniature come from?

The word "miniature" comes from the Latin name for red paint "minium" and in the original refers to antique or medieval paintings in the genre of illuminated manuscript. Due to the small size of these paintings and the presence of the prefix "mini" in the word, an etymological metamorphosis later occurred, as a result of which any small drawings, especially portrait miniatures, began to be called miniatures. From painting, the term also penetrated into literature, where it refers to works of a small format.

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source of maternal instinct 03.09.2019

Biologists from Louisiana State University (USA) conducted a study on two groups of mice: the first were males, the second - females. The researchers found a group of cells activated by the hormone oxytocin in the brains of female mice, while no such cells were found in male mice.

Oxytocin is also known as the "love hormone" and plays an important role in regulating behavior, including maternal behavior.

"Many scientists have tried to figure out the difference between the oxytocin system in women and men, but no one has yet found conclusive evidence. Our discovery came as a big surprise to us," said Ryoichi Teruyama, assistant professor of biological sciences at the University of Louisiana.

Oxytocin receptors, as it turned out, are contained in the area of the brain responsible for the so-called maternal behavior. Moreover, biologists reported that the expression of oxytocin receptors in these cells is observed only when estrogen, the female sex hormone, is also present there. Therefore, these cells are involved in stimulating the "maternal instinct".

Recent studies have already demonstrated an association between altered oxytocin receptor expression and postpartum depression, which occurs in approximately 10-20 percent of women who have recently given birth. According to biologists from Louisiana, their discovery could help create new methods for the treatment of postpartum depression, which would already be the cells that are activated by oxytocin.

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