It's Christmas: be very, very careful...

The press releases don't stop coming at this time of year; but they do change character slightly. And this year in particular, I'm hearing from a lot of hospitals and academics, and all they seem to want to do is scare me.

Dry ice falls as snow on Mars

NASA's Mars Reconnaissance Orbiter (MRO) has returned the first definitive evidence of carbon dioxide snowfalls on Mars - the only place this is known to happen anywhere in our solar system.

Yes, it snows on Mars


Clouds of snow blanket the Red Planet's poles during the dead of a Martian winter. However, unlike Earth's water-based snow, the particles on Mars are actually frozen crystals of carbon dioxide.  



Loss of Arctic ice causes snowy northern winters

Colder-than-usual winters in the US and Europe could be caused by the shrinking of ice cover in the Arctic.           

Why does it rain more near airports?

Areas around airports experience more rain and snow, say researchers, as planes trigger precipitation by flying through clouds.