On this day in history, NASA announced that its Curiosity rover found signs that might have pointed to life on Mars. On Dec. 9, 2013, NASA scientists reported that the rover had discovered signs of a water hole that existed around 3.

Curiosity has just finished the latest leg of its 12-year Mars mission and will now set out to explore miles of web-like surface features left behind by ancient water on the Red Planet. The zig-zagging rocks could also provide clues about whether Mars once harbored extraterrestrial life.

The Mars rover, built by NASA's Jet Propulsion Laboratory (JPL), has slowly scaled Mount Sharp since 2014. This mountain, officially monikered "Aeolis Mons," was discovered in the 1970s; cut into its alien landscape is the boulder-packed Gediz Vallis channel, which some scientists believe to be an ancient river bed.

NASA scientists are hoping to understand the history of where they found the rocks — and for evidence of ancient microbial life

Curiosity rover heads to Mars' "spiderweb" formations for study New target will reveal clues about Mars' ancient water history Curiosity’s mission extends with the exploration of Martian boxwork

Tens of millions of miles from home, NASA's Curiosity rover has shared what it's grateful for this Thanksgiving

NASA's Perseverance rover has unearthed a compelling clue in the hunt for past Martian life. A rock sample dubbed "Cheyava Falls," found in Jezero Crater, contains signs of ancient water and organic compounds.

NASA's Perseverance rover uncovers intriguing rock sample on Mars, nicknamed 'Cheyava Falls,' which may hold evidence of ancient microbial life and water on the Red Planet.