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Does Betelgeuse Have a Companion?
France · France

Does Betelgeuse Have a Companion?

The brightness of Betelgeuse, one of the brightest stars in the sky, varies according to a double period of four hundred days and six years. This second cycle would result from the presence of a companion star, which would be detected.Read Article
Lacepède: a Careful Transformation at the Turn of the 19th Century
Species · Paris

Lacepède: a Careful Transformation at the Turn of the 19th Century

At the very beginning of the 19th century, while Lamarck developed the first great transformist theory to explain the appearance of species, the naturalist Lacepède, whose bicentenary of death is celebrated this year, defended more moderate conceptions, but also more acceptable for the time.Read Article
Materials that Can Emit More Light than They Can Absorb
France · France

Materials that Can Emit More Light than They Can Absorb

According to the laws of physics, the emissivity and absorptiveness of a material must be identical. But in the presence of a magnetic field, some materials do not comply with this rule. A trail for new technologies.Read Article

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