It’s a fairly dry and dusty world, so how did Mars get its frosty poles?

It’s a fairly dry and dusty world, so how did Mars get its frosty poles?
Using the former spacecraft Cassini, scientists have found evidence for rainfall near its north pole
It’s the school holidays, so why not show your children how they can see their favourite planets from Earth?
Summer’s coming, but the rest of the Solar System’s weather forecast is very different.
Should you be taking extra care when using one of these specialist telescopes?