Science How a solar flare could send us back to the Stone Age

A powerful enough solar flare could knock out our power grids, disrupt our GPS satellites, and bring the global economy to a halt, warns a British scientists.

NASA/SDO/AIA/AP/File

A stream of highly charged particles from the sun is headed straight toward Earth, threatening to plunge cities around the world into darkness and bring the global economy screeching to a halt.