5 février 2015

Des milliards de "Terres"?

Ça semble tout à fait possible, et même probable:

Using a 200 year-old statistical technique, a team of Australian astronomers have concluded that virtually every star in the Milky Way hosts at least one to two terrestrial planets capable of fostering life.

Right from the outset, it's important to note that this is not an empirical study per se. The researchers, led by Tim Bovaird and Charley Lineweaver from the Australian National University, reached their conclusions by applying a centuries-old technique called the Titius-Bode relation to predict the positions of hypothetical planets that space-based and terrestrial telescopes cannot detect.

Sometimes referred to as Bode's Law, the Titius-Bode relation hypothesizes that celestial bodies in some orbital systems orbit at semi-major axes in a function of planetary sequence. It was discovered in 1766 by Johann Daniel Titius, who showed that the orbits of planets in the solar system follow a simple arithmetic rule quite closely.

1 commentaire:

fylouz a dit…

Ça fait peur :


Ça, par contre, c'est plus sympa :


On a même droit à la vision d'une jumelle de la Terre...

Et si nous étions en orbite d'autres étoiles :