Researchers say bursts of energy emitted from black holes could wipe out life on Earth in a moment.
A black hole releases more energy in one second than the sun will in its entire 10-billion-year lifetime. These bursts of electro-magnetic waves, called "death from space," can travel billions of light years.
Like lasers firing in space, these waves can cut through galaxies, leaving a trail of destruction behind.
Scientists have warned such emissions could wipe out the earth’s ozone layer, exposing life to all sorts of radiation.