Imagine one day your electricity suddenly goes out, gadgets stop working, and cars come to a standstill on the roads.
And what if the power grid remained dark for months, or even years, resulting in millions of deaths across America?
That's a nightmare scenario many experts worry could become reality if an electromagnetic pulse bomb, or EMP, detonated a hundred miles or so above the earth, right over North America.
Who could attack us that way? In February, North Korea announced it launched a weather satellite -- a move the United States and other nations quickly condemned as an attempt to further develop long-range missile capability.
However, rogue nations and terrorists aren't the only concern.
EMPs happen naturally, too. A powerful geomagnetic storm from the sun could also cause a worldwide catastrophe. A solar storm that powerful hasn't hit the earth since 1859, but NASA says we are long overdue for another.
Dr. Peter Vincent Pry is executive director of the EMP Task Force on National and Homeland Security. In his book, Blackout Wars, Pry says we must act quickly to defend America against what is perhaps the greatest threat that has ever challenged civilization and one that could usher in a new Dark Age.
Dr. Pry talks with CBN's Pat Robertson about the threat of an EMP catastrophe on Tuesday's 700 Club, August 2.