On January 8, 2025, a small red dot appeared on NASA’s monitoring system. This was just the beginning of a wildfire that would devastate California, taking lives and destroying homes. Thanks to the Aqua satellite, data streamed down from space that helped manage the firefighting efforts. Aqua isn’t just any satellite; it uses infrared sensors to see changes on Earth that we can’t detect ourselves.
When Aqua identifies a fire, NASA converts the infrared data into GPS coordinates. This helps responders track the fire and act faster than typical emergency calls. The satellite’s capability, called the Moderate Resolution Imaging Spectroradiometer (MODIS), plays a crucial role in monitoring the planet. Its data can even alert teams quicker than traditional methods.
But scientists have recently discovered issues with this data. Logs have shown errors, and the culprit may be space debris. This problem is particularly troubling for climate change research, which relies on accurate data to guide policymakers. As space debris increases, the reliability of important satellite data may decrease.
Aqua is part of a trio in NASA’s Earth Observing System (EOS), working alongside Terra and Aura. These satellites gather vital information about the environment, tracking everything from cloud patterns to ocean conditions. Since 2005, the EOS satellites have had to maneuver away from space debris over 32 times, potentially compromising the integrity of their data.
Andrew Bonwick, vice president at Relm Insurance, notes that the economic impact of space debris is significant. Every time a satellite needs to dodge debris, it uses precious fuel. “Each maneuver incurs a cost,” he stated. “Even without collisions, space debris adds economic burdens.”
A 2018 report from NASA warned that the risk of satellite collisions is growing. In just 15 years, ESA reported an increase from about 16,000 tracked pieces of debris to over 44,000 by 2026—an alarming rise of almost 180%. Most fragments are too small to track but can still cause significant damage, highlighting the risks satellites face in low Earth orbit.
The legacy of Aqua is impressive. It has provided extensive climate data for over two decades. However, it is now approaching its end. With only about 66 pounds of fuel left, Aqua is expected to shut down later this year, leaving a significant gap in climate data collection.
Despite this impending shutdown, NASA continues to rely on fire detection through the Visible Infrared Imaging Radiometer Suite (VIIRS). As government funding wanes, private companies are stepping in. Google has announced plans to deploy new satellites focused on fire detection, promising even greater precision than before.
Aqua recently celebrated its 24th birthday, completing more than 126,000 orbits of Earth and contributing to over 30,000 scientific publications. The insights it has provided over the years will be hard to replace, marking a significant milestone in climate science.
