The Giant Leap by Adrian Berry
A great book (in my opinion) on why intersteller travel will happen and why its a good idea.
Moonrush: Improving life on Earth with the Moon's Resources by Dennis Wingo
Another good read on utilizing the moon and asteriods as resources we can use to better life on this planet
These 2 are the most current books ive purchased and read as of late, but from reading this particular threat, theres ALOT more out there. I also have an older Carl Sagan book "The Cosmic Connection" that i 'borrowed' from my mom