On the steel breeze

Hundreds of years from now mankind will finally inherit the stars. A fleet of holoships is heading towards the nearest habitable planet at 15% the speed of light. In massive asteroids turned into ships, tens of millions of people are heading towards a new home. A home that bears signs of an ancient alien civilisation. No-one knows what they will find when they get there in 90 years. But the main problem is that the ships will have to break the laws of physics to be able to stop. And the research into ways to stop risk the ships themselves. Has mankind squandered the utopia of years past?