The Australian physicist Brad Carter, "it could happen soon for a few days to see two" suns "in the sky like a thousand years ago."
The effect, however, the explosion of a supernova occurred about 640 years ago. (MAYBE)!
Earth heated and lit by "two suns". But only for a few weeks. The cause? The explosion of one of the brightest stars in the night sky, visible to the naked eye. The news comes from Australia, physical Brad Carter of the prestigious University of Queensland, and the Daily Telegraph, the newspaper of the United Kingdom, "it could happen shortly." Even in the now inflated and full of disasters, "2012."
the candidate to "burst" (or already 'bursting) is Betelgeuse, a red supergiant of spectral class M1-2 Iab, or a star in a fairly advanced stage in its evolution. In the constellation of Orion, looking at the top left is red. The other in the bottom right, Rigel, is white-blue. It is not very close, but not so far from not being able to see with the naked eye is located at 640 light years from Earth. With the outbreak will "transform" in supernova explosion energy which is the very final stage of the evolution of massive stars.
"May explode as a supernova is safe, but knowing when it will happen is nonsense," explains Piero Benvenuti, professor of astrophysics at the University of Padua and president of the INAF (National Institute of Astrophysics) until 2007. What happens? "It runs out of the source, the nuclear fuel that is located inside the star. This collapses and the materials that compose it are thrown out, creating a fireball that expands at a speed of 5, 10 thousand kilometers per second ". In the case of a star like Betelgeuse, "relatively close - explains Welcome - The event would be visible even in daylight. But it would be very difficult to define as a "second sun". There is still a great distance. Just imagine that the sunlight reaches the Earth in 8 minutes, while that of Betelgeuse, and now when it will supernova, there will 640 years. From the scientific point of view is a great opportunity to study. It is rare to see an explosion galactic.
saw a giant star to shine by day, the Chinese in 1054: "It was in our galaxy in the constellation of the Crab - recalls the professor -. In 1572 the Danish astronomer Tycho Brahe, and in 1604 he observed a Johannes Kepler and Galileo Galilei I saw another naked eye. "Where does the stellar matter?" A huge quantità di neutrini - continua - passa a velocità della luce in tutte le direzioni, arriva sulla Terra senza trovare ostacoli. E gli elementi chimici interni alla stella vengono espulsi, ma nel caso della stella Betelgeuse non ci raggiungeranno mai perché viaggiano a una velocità inferiore della luce. Arriveranno radiazioni energetiche, raggi gamma, X e ultravioletti. Ma prima di toccare la superfice della terra verranno assorbiti dall'atmosfera". Al di là della scienza e dell'astronomia. Una volta di più fa notizia la data 2012.
Da: Antikitera.net
Rossella Burattino
News originale: Daily Telegraph.
0 comments:
Post a Comment