Annihilation

There are simulations to be seen  of asteroids hitting us and the threat is real,
the consequences are horrendous,
The cataclysmic will crush all in its path and mean our demise.
Is this what drove the dinosaurs  to extinction,
Was it a collision with a giant rock that extinguished everything and caused a nuclear winter.
They say it's not if but when the next fatal strike will be,
And we dont stand a chance,
How long then as a species do we have before the inevitable happens,
Because objects are flying past us continuously, 
How many near misses have there been,
How far are we away from being annihilated, 
When will the next fireball  travelling at tremendous speeds be,
When is the date for doomsday.
When the missile makes contact and hits the target,
The damage will be in biblical proportions,
The damage will be decisive,
With prior warning will we be able to intercept and throw it off course,
Or will we cease to be,
Is the thought of an ending and being reduced to rubble and ash to much to contemplate.