  We announce the discovery of a planetary system with 7 transiting planets
around a Kepler target, a current record for transiting systems. Planets b, c,
e and f are reported for the first time in this work. Planets d, g and h were
previously reported in the literature (Batalha et al. 2013), although here we
revise their orbital parameters and validate their planetary nature. Planets h
and g are gas giants and show strong dynamical interactions. The orbit of
planet g is perturbed in such way that its orbital period changes by 25.7h
between two consecutive transits during the length of the observations, which
is the largest such perturbation found so far. The rest of the planets also
show mutual interactions: planets d, e and f are super-Earths close to a mean
motion resonance chain (2:3:4), and planets b and c, with sizes below 2 Earth
radii, are within 0.5% of the 4:5 mean motion resonance. This complex system
presents some similarities to our Solar System, with small planets in inner
orbits and gas giants in outer orbits. It is, however, more compact. The outer
planet has an orbital distance around 1 AU, and the relative position of the
gas giants is opposite to that of Jupiter and Saturn, which is closer to the
expected result of planet formation theories. The dynamical interactions
between planets are also much richer.
