http://truthufo.blogspot.com/: ufo

Thursday, 21 August 2008

ufo

Astronomers have discovered more than 270 exoplanets orbiting other suns, including 25 suns with more than one planet. The first in 1995 by the team of Michel Mayor (Switzerland) at the Centre de Haute-Provence (Vaucluse). Most of them are Jupiter, but orbiting very close to their star, they are hot and these solar systems are very different from ours. A few rocky planets, exo-Earth but more massive, have been discovered. The first by a team led by Jean-Philippe Beaulieu (2), the Institut d'Astrophysique de Paris (CNRS). Initial statistics suggest that "a few percent of stars are accompanied by giant gaseous… and up to 30% of planets, rocky." With one hundred billion stars in our Galaxy, it was difficult to imagine that there is no other similar system to ours. Yet, he says, "is the first time that we put the telescope on a two gaseous planets cold, because of their distance from their star - 2.3 and 4.6 astronomical units [a ua corresponds to the average distance Earth-Sun, or 149 million kilometers, ndlr] - and low brightness of the star. "

Track
While it took so long to discover the first system to two giant fairly far from their star to be cold, they are very difficult to detect by the methods of tracking down the most often used. In general, astrophysicists scrutinize tirelessly stars closest on the lookout for a variation of their light that could be caused by one or more planets in orbit. The teams that lead this adventure engaged in a fierce competition.

This is the reverse for the team Beaulieu. "We operate on the mode of cooperation, it is said, they share everything and sign on together," Fun-t-il. In this bunch, there is even two lovers of New Zealand, "on alert that if you are sure of our time, because they work day." Astrophysics A Communist? No! is the strategy of tracking down who wants it. Beaulieu and his colleagues are counting on nothing less than a mirage to find their cosmic exoplanets. They look much further than the other teams, several thousand light years toward the center of the galaxy. There, a Polish team monitors every night, with a telescope in Chile, the brightness of twenty million stars. And with phlegm attend an event, rare for a star but often if you look at all: the passage of a small battery-haired star in the line of sight of the telescope.

Then comes the miracle predicted by Einstein saint: the gravitational field of the star pass the light curve from that background and the fact converge to the telescope. This "gravitational lensing", a sort of cosmic mirage, amplified 200 times the light of the star involved in the discovery published today. For a few days, the time of passage, the light curve of the star draws a bump very regular.

Star
On 28 March 2006, Poles see an early bump. As soon as they launch the alert. And all teams - Chile, New Zealand, Israel, NM, Arizona, Tasmania, Canary Islands - steered their telescope on the star of the moment. "The sun never rises not on our cooperation, laughs Beaulieu, it is always night one of our telescopes referred to the star, we can follow this hump without interruption." In April, from 5 to 8, small Peak light betray planets. Then, all these measures passing under the forks caudines mathematics to rule out other explanations and calculate the masses and distances from the star. Bingo!

Especially bingo that the presence of giant planets far from the Sun has played a large role in the habitability of our solar system ejected from comets away from planets and stabilizing whole. If life needs such a system, there is less reason to believe that it is lonely. Beaulieu cowardly, moreover, that "other discoveries are in the pipes." Should we rush on the construction of telescopes able to discern traces of life on these planets? "Not so fast," moderates "he says. To study their atmospheres in search of molecules reveal a life similar to Earth assumed to have discovered the exo-Earth close enough to be observed in detail. And to have better understood the process of formation of these planets. It is therefore not immediately… but approaching where scientists will draft instruments, terrestrial or space, whose official objective is stalking of life in the Galaxy.