Extinction in Time (en Inglés) - Michael Grekin

They traveled across time to save their species.
Instead, they may have condemned an entire world.

When the last survivors of a dying Mars launch the starship Endurance on a desperate mission to find a new home, they expect the unknown.
They do not expect to arrive 2.7 billion years in the Future.

What they find is Karth - a world that looks like salvation.
A perfect atmosphere. Vast oceans. Endless life.
A paradise untouched by time.

But paradise comes with a price.

As the crew begins to settle, something emerges from the depths of this ancient world - massive predators, a fragile ecosystem, and a truth more dangerous than anything they have faced before:
This planet is not theirs to claim.

When a civilization-ending asteroid is discovered on a collision course with Karth, the crew is forced to make an impossible choice:

Save the planet...
or ensure their own survival.

As loyalties fracture and time itself becomes the enemy, one decision will determine not just the fate of their species...
but the fate of all life on the planet.

Extinction in Time is a gripping, high-concept science fiction thriller that blends cinematic action, real scientific theory, and moral tension into a story where survival and sacrifice collide.

Perfect for fans of Michael Crichton, The Martian, and The Twilight Zone, this is a story that asks:

If saving humanity means destroying another world... would you do it?

A Fractured Time Series Novel