Asteroid, Comets, and other Things that bump in the Night

"Art thou not he who that dried the sea, the waters of the great deep: that hath made the depths of the sea a way for the ransomed to pass over?" 2Nephi 8:10
I was watching a Learning Channel program while doing dishes and folding clothes and I couldn't help but remember last night reading with Rachel when the question on the program was asked - How will we protect our world from an asteroid? Ah since we can see the potential disaster it's now a problem. What about that which we still can't see? Other disasters that we don't have the telescopes, microscopes, or other technology invented yet?
Maybe the answer could be to get to know the person who suspended us in space with gravity, created day and night, hot and cold - just the perfect distance from the heat source - provided a food supply and obviously been protecting us from asteroid terrors for centuries.
But what about the "calamities" and "scourges" predicted in the last days? We might just need to rely on the person who our ancestors relied on in less technical ages. " Hearken unto me, ye that follow after righteousness. Look unto the rock from whence ye are hewn, and to the hole of the pit from whence ye are digged."
We won't be really sure where the difficulties will come or strike unless we have some kind of insight or previous warning.