Science What's causing those space X-rays? Scientists solve mystery. (+video)

For decades. scientists have debated the source of the low-energy X-rays that fill the sky. Now they say they have an answer.

By , Live Science Contributor

NASA/RXTE-COBE/Revnivtsev et al.

There's an eerie glow that fills the sky but is visible only to X-ray detectors, and now, scientists have discovered the sources of it.