NASA’s Curiosity rover observed a feather-shaped iridescent cloud, offering insights into Martian atmospheric conditions.

Madhavan Nair Rajeevan’s new book tracks shifts over 50 years, explores models we need to build. ‘We must find ways to track it; there’s simply too much at stake,’ he says.

We've all noticed how grey and gloomy it's been recently but are there any signs of some sunshine in the forecast?