Showing results by author "Colin Stuart" in All Categories

Un guide fascinant et complet sur le soleil, notre étoile d'origine. Cet astre reste le plus grand mystère de notre système solaire, et aujourd'hui plus que jamais sa compréhension s'avère essentielle à notre futur sur la planète Terre. En 1869, un grand mystère est né. Alors que les astronomes observaient une éclipse solaire totale, ils ont vu pour la première fois la faible lueur de la couronne solaire, l'atmosphère extérieure du soleil.

In 1869, a great mystery was born. As astronomers observed a total solar eclipse, for the first time they saw the faint glow of the solar corona, the sun's outer atmosphere. Measurements of a previously unknown wavelength that made up this solar light sparked hot debate among scientists, but it was another 60 years before they discovered that this wavelength was in fact iron being burned at a staggering three million degrees Celsius. With the sun's surface only 6,000 degrees, this shouldn't be possible.