See also <a href="http://www.ice.cat/personal/iribas/Proxima_b/indepth.html" rel="nofollow">http://www.ice.cat/personal/iribas/Proxima_b/indepth.html</a><p><pre><code> Not the Earth 2.0
In any case, and although it is an excellent candidate
planet that could harbor life, Proxima b cannot be
considered an Earth twin. One thing is certain, in fact:
the history of Proxima b and its star was radically
different from the history of the Earth and the Sun. The
formation of Proxima b, the irradiation by its star, the
tidal forces it suffers affecting its internal structure
and rotation, its possible climates have no equivalent in
the history of our planet.</code></pre>