  We introduce and experimentally demonstrate a method, where the two intrinsic
time scales of a molecule, the slow nuclear motion and the fast electronic
motion, are simultaneously measured in a photo-electron photo-ion coincidence
experiment. In our experiment, elliptically polarized, 750~nm, 4.5~fs laser
pulses were focused to an intensity of $9\times10^{14}\mathrm{W/cm}^2$ onto
H$_2$. Using coincidence imaging, we directly observe the nuclear wavepacket
evolving on the \ssg{} state of H$_2^+$ during its first roundtrip with
attosecond temporal and picometer spatial resolution. The demonstrated method
should enable insight into the first few femtoseconds of the vibronic dynamics
of ionization-induced unimolecular reactions of larger molecules.
