f looking at this Mars vista conjures up childhood memories of the song, “One of these things is not like the others,” NASA scientists are right there with you. 

Perseverance, a car-size lab on six wheels, traveled into the Red Planet’s Neretva Vallis last week. Though this region may look like a barren desert, it was once an ancient river channel that fed into the Jezero crater billions of years ago. 

As Perseverance traversed the inlet, the rover came upon a hill covered in boulders, with one in particular attracting the science team’s attention: a light speckled rock amid a sea of dark lumps. 

“Every once in a while, you’ll just see some strange thing in the Martian landscape, and the team is like, ‘Oh, let’s go over there,'” Katie Stack Morgan, deputy project scientist of NASA’s Mars 2020 mission, told Mashable. “This was like the textbook definition of (chasing) the bright, shiny thing because it was so bright and white.”

The boulder is so exceptional, scientists have said it’s in a league of its own. Closer analysis with the rover’s instruments shows it is likely an anorthosite, a rock type never seen before while exploring Mars, Stack Morgan said, though there have been signs such rocks should exist. Not even the Curiosity rover, which has observed more variety in Gale Crater, has seen one quite like this.