Giant planet beyond Solar System hot enough to boil iron  

A huge planet beyond the solar system has an upper atmosphere hot enough to boil iron, scientists have discovered. The international team identified glowing water molecules in the stratosphere of the exoplanet WASP-121b, which is 900 light years from Earth. Water vapour in a planet's atmosphere behaves in predictable ways depending on its temperature. While cool water vapour blocks specific wavelengths of light, vapour at higher temperatures causes them to "glow". Glossary The radiation was in t