Mars curiosity rover

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Curiosity launched to explore Mars five years ago, to celebrate, here are five cool discoveries made by the rover.

Unfortunately, all good things eventually come to an end, as Nelly Furtado famously declared. Today we say goodbye to one of the biggest leaps in human history. We bid a farewell to NASA's Opportunity rover, abandoned and alone around 140 million miles (225 million kilometers) away from our planet.

Scientists are still trying to figure out where Mars' methane comes from. Now there's a new mystery that might be connected: unusual fluctuations of oxygen in Mars' atmosphere, detected by the Curiosity rover.

Mars Exploration Rover diagram

Three thousand days and counting: Nasa's Curiosity rover continues its extraordinary exploration of Mars.