It happened just before he reached the zero point, the no-man's land in space where the attenuated gravity fields of two planets meet and cancel out. Maynard was dividing his attention equally between the transparent bubble that housed the Meinz pendulum and the two ports, forward and aft, that broke the steel panelling of the control cubicle. He listened critically to the measured clicking of the Geiger counters and the quiet sibilance of the air purifiers, and in spite of his weightlessness an