NASA's Curiosity rover has made a groundbreaking discovery on Mars by uncovering pure sulfur crystals within a broken rock.

Get Instant Summarized Text (Gist) Sulfur in the universe, previously thought to be missing, may be trapped in ammonium hydrosulfide salt on cosmic dust and pebbles. Laboratory experiments under ...

The rock appears to have some company. Curiosity found a field of similar light-toned rocks that may hide the same sulfur secret. The discovery has drawn the attention of Mars scientists.