The Mars rover Opportunity is dead after a record-setting 15-year run, but its memory – and scientific discoveries – live on.
NASA announced Wednesday that the Mars rover was deemed dead after it hadn't communicated in more than eight months.
Opportunity, along with twin Spirit, had unprecedented success and contributed greatly to scientific understand of the red planet, NASA said.
"We're celebrating with emotion. Science is an emotional affair,'' said Thomas Zurbuchen, associate administrator of NASA’s Science Mission Directorate. "It’s a team sport, and that’s what we’re celebrating today. I will never forget the amazing work that happened here. It transformed our understanding of our planet.’’
Farewell to a 'workhorse': Mars rover Opportunity officially dead after 15 years
To remember Opportunity, here are some of its greatest moments and discoveries:
Water on Mars
Opportunity was instrumental in helping determine that Mars once had liquid water and could have been able to support microbial life. NASA said Opportunity hit a "hole in one" when it first landed in a crater and found the mineral hematite.
Nicknamed "blueberries," the hematite spheres typically form in water on Earth, NASA said.
Oppy proved beyond a doubt that ancient Mars had lots of liquid water. These hematite spheres, nicknamed "blueberries," formed in the presence of H2O. https://t.co/2kz6YLjRer#ThanksOppy pic.twitter.com/L9yS0a7k1X— Spirit and Oppy (@MarsRovers) February 13, 2019
"Rocks near the Opportunity rover's landing site ... contained pearl-shaped rocks that formed in pre-existing wet sediments, as well as finely layered ripples, crossbeds, and niches where crystals once grew and were later redissolved," NASA said.
In addition to the "blueberries," Opportunity also made other key discoveries to support our understanding of water on Mars.
The rover had a "slam-dunk" discovery when it spotted bright mineral veins that likely formed from flowing water underground. It discovered the mineral jarosite, too, which forms in the presence of acidic water, NASA says.
Surviving craters and dust storm
Opportunity had to traverse the inhospitable, sandy Mars terrain and faced great adversity in the process.
After it first landed, Opportunity struggled to drive out of Eagle Crater, NASA said. The team behind the rover also had to strategically plan how to get out of Endurance Crater, with up to 31-degree slopes, as well as "Purgatory Dune," which took five weeks of planning and driving, NASA said.
A record-breaking run
Opportunity and Spirit originally had their mission planned for 90 days, but the duo far exceeded the goal. Spirit was ruled dead in 2011, a year after it got stuck in sand and stopped communicating.
But Opportunity kept roaming, and in doing so, set the record for off-Earth roving distance at 28.06 miles. Spirit traveled a distance of roughly 4.78 miles. China's Yutu 2 on the moon and NASA's Curiosity on Mars could beat Opportunity's record, though.
Space selfies and snapshots
While Opportunity contributed greatly to scientific understanding of Mars and its geology and climate, many knew the rover for its iconic selfies and photos.
To the robot who turned 90 days into 15 years of exploration:— Spirit and Oppy (@MarsRovers) February 13, 2019
You were, and are, the Opportunity of a lifetime.
Rest well, rover. Your mission is complete.
Contributing: Jorge L. Ortiz, USA TODAY.
Follow Ryan Miller on Twitter @RyanW_Miller
This article originally appeared on USA TODAY: From discovering water to snapping selfies: The lasting memories of Mars rover Opportunity