Things get really weird in deep space. The universe is almost infinite, meaning that if it's possible for something to happen, it's almost certainly happening out there somewhere. Burning ice, for example.
First things first, what's an exoplanet? That's easy to answer - it's any planet that exists outside our own solar system, and so far, scientists have discovered thousands of them. This particular one, Gliese 436 B, is relatively close to us - a mere 30 light years away. Around the size of Neptune, the massive density of the planet forces its surface water to remain solid, even though the temperature is in excess of 570 Fahrenheit. Unable to melt, the water boils off as vapor and escapes back out into space, drifting towards the same Gliese sun that boiled it.