On the off-chance you're alive in 150 years, you could be in for a very bad day, when the asteroid Bennu collides with Earth,
Knowing the course the space rocks take as they make their periodic swings through our cosmic neighborhood does a lot more than just let us know how long our species has to live before an incoming bit of ordnance sends us the way of the dinosaurs. It also means we can do something to prevent the disaster from happening at all.