What NASA mission, using data from its MAVEN spacecraft, reported the first clear evidence of lightning on Mars in March 2026?

The Mars Atmosphere and Volatile EvolutioN, or MAVEN, mission provided the first clear evidence of lightning on Mars in March 2026 through the analysis of its extensive dataset. While MAVEN's primary goal was to study the planet's upper atmosphere and its loss to space, its instruments gathered a wealth of information over its operational lifetime, which proved crucial for this groundbreaking discovery. Scientists, poring over a decade of archived data from the spacecraft, identified specific electromagnetic signals that are the telltale signs of electrical discharges.

The key to this detection was the identification of "whistler" waves, which are low-frequency radio signals generated by lightning strikes. On Earth, these waves travel along magnetic field lines through the magnetosphere, creating a characteristic descending whistle (Review) sound. Despite Mars lacking a global magnetic field like Earth's, localized magnetic fields in its crust allowed these whistler waves to propagate and be detected by MAVEN's instruments. This discovery was particularly challenging, as only one such clear signal was found among over 108,000 measurements, highlighting the rarity and specific conditions required for such an observation.

This revelation significantly enhances our understanding of the Martian (Review) atmosphere and the processes occurring within its formidable dust storms. For decades, scientists theorized that the friction of dust grains in these storms could generate electrical charges, leading to lightning-like phenomena. MAVEN's data now confirms these suspicions, offering insights into the planet's atmospheric chemistry and the potential for electrical activity to influence its environment. Although MAVEN ceased communications in late 2025, its legacy continues to unfold through the ongoing analysis of the invaluable data it collected during its mission.