A rock on Mars spilled a surprising yellow treasure after Curiosity accidentally cracked through its unremarkable exterior.

The rover's latest discoveries, including pure sulfur stones and sprawling mineral "spiderwebs," unravel new mysteries of Mars' watery past.

After 12 years exploring the red planet, NASA's Curiosity rover is still going strong. The robot has spent the past year meandering along the Gediz Vallis channel, which may have been an ancient river bed when Mars was wetter.

For twelve years, we've watched Curiosity crawl its way over the rocky surface of Mars, decoding mysteries of the Red Planet and broadcasting back home pictures and data from the strange Martian environment.