The heat generated by the formation of molecules and reduction of space between atoms causes the new planet to give off steam.
The steam rises, hits cold space and freezes.
“What?” you say; frozen water surrounding a planet? If that were so certainly you would have known about it already, right?
All the evidence points to a Killer Crash between two new planets between Mars and Jupiter, one fully formed, the other just beginning. The debris from this crash has done a good job of hiding the existing ice layers.
The inner planets have all lost their ice layers, but, the other planets still have theirs. The ice layer of Mercury melted, being so close to the Sun, but ice is present in the polar craters. The ice layers of Venus and Mars have been eroded by solar winds. Mars still has a significant amount of water-ice clouds in its atmosphere due to what remains from its ice layer. Geological events led to conditions that destabilized Earth’s ice layer, causing it to rapidly melt; this development is covered in the Continental Cataclysm book series.
Jupiter and Saturn are covered by debris from the Killer Crash, so that we do not directly see their respective ice layers. Most likely, Uranus and Neptune also have a thin covering of gaseous debris from the Killer Crash. So, their ice layers are hidden.
The JUNO space probe is scheduled to arrive at Jupiter in 2016. I don’t know if it is capable to penetrate the outer gaseous layers to see the ice layer underneath or not. In the meantime, the infrared image of Jupiter featured in this post indicates the ice layer under the debris layer.