A big sleep

Sedna made the final approach, unaware of her proximity to the icy, rocky comet. Her solitary mission, the first comet walk in history. Suspended animation was necessary for the three-year flight, to preserve water and oxygen, and protect the astronaut from the effects of isolation until she could be reawakened. Approaching too fast, the craft collided with the comet, damaging the radio antenna but keeping life-support intact. Sedna knew none of this. Reanimation sequence had failed. Onward she flew, anchored to the comet, to the outer reaches of the Solar System. Orbital period 11,400 years. To sleep perchance to dream.