Lost and Found (Remnants, #10)

Official Summary:
It’s been 90 days since the Remnants broke the Big Compromise, turning Mother from her course. Now they’ve arrived at the place they called home. . . . 500 years ago. But a lot can change in five centuries. Earth has been transformed into a wasteland of ash and debris. And if that isn’t bad enough, while the rest of the Remnants pull together to survive, Yago is slowly pulling away -- concocting a plan to rise to power. With only 13 Remnants remaining, failure could mean the end of the human race. . . .

Back-of-Book Summary:
They say you can always go home again. That may be true for some, but what if you have to go home after 500 years? After an asteroid destroys everything you know? That's what's happening to Jobs and the rest of the Remnants. He mistakenly found what was left of Earth on Mother's -- the ship's -- scanners. And now they're going to try to go home.
But what, if anything, is left of the Earth they once knew? Will there even be a human race -- or has evolution started all over again? And in order to get back to Earth the Remnants will have to break the compromise they've made with the other alien life forms aboard the ship. This is not a good thing. In fact, it's very bad. Because these aliens can stop Jobs and the others from ever setting foot on Earth again. . . .