Its diameter exceeds the corresponding figure of our star 1.3 thousand times the brightness 1 million times
Astronomers from France in the constellation of Centaurus saw one of the largest stars in the Universe belonging to the class of yellow hypergiants. At this point the star is called HR 5171A, it is removed from the Earth is 12 thousand light years.
Star HR 5171A in presenting scientific artist / ESA
Instruments of the VLT telescope helped astronomers to estimate the size and other parameters of the giant star HR 5171 A in the constellation of Centaurus, whose brightness is about a million times higher than that of our Sun, and find her “secretive” companion, said in the journal Astronomy & Astrophysics.
“Observations of HR 5171 A has shown that this world is a neighbor, orbiting around it in close orbit, which is extremely surprised us. These stars are located to each other so close that they touch each other, and the whole system resembles a gigantic peanut walnut. This star-companion is interesting for us from the point of view that it could potentially “strip” the outer shell of a giant and thereby change the course of its evolution,” said Olivier Honestly from the Observatory of the côte d’azur (France). Continue reading
The dust and ion tails of comet Hale-BOPP
But, in spite of research that freedom from prejudice was very slow: for example, Louis XIV was afraid of the comet of 1680 year, because it’s considered a portent of his death. The greatest contribution to the study of the true nature of comets was made by Edmond Halley. His main discovery was the establishment of the frequency of appearance of the same comet in 1531, 1607, 1682 Passionate about astronomical research, Halley became interested in the movement of the 1682 comet and calculate its orbit. He was interested in the path of its movement, and since Newton had already conducted similar calculations, Halley turned to him. The scientist immediately gave the answer: the comet will move in an elliptical orbit. At the request of Halley Newton presented his calculations and theorems in the treatise “De Motu”, that is “On the move”. Having the assistance of a Newton, he was engaged in calculation of cometary orbits by astronomical observations. He managed to collect information about the 24 comets. Thus appeared the first catalog of cometary orbits. In its catalog Halley found that three comets are very similar in their characteristics, from which he concluded that it’s not three different comets, and the periodic appearance of the same comet. The period of its occurrence was equal to 75.5 years. She was subsequently named Halley’s comet. Continue reading