Mars Auroras Work Like Earth's, NASA Scientists Discover

Scientists just cracked a major mystery about the Red Planet's dazzling light shows, and the answer brings Mars a little closer to home.

Using data from NASA's MAVEN spacecraft, researchers discovered that certain Martian auroras form through the same process that creates Earth's northern and southern lights. The findings, published in Nature Communications, show that a cycle of magnetic reconnection happening above Mars' surface fires electrons into the atmosphere to generate auroras, just like on Earth.

The twist? Mars does this on a much smaller scale because it lacks a global magnetic field like our planet has. Instead of one protective magnetic bubble, Mars has dozens of tiny magnetospheres scattered across its surface, remnants from when ancient lava cooled 4 billion years ago in the presence of a long-vanished global field.

"We knew that magnetic reconnection was happening at Mars but did not expect it to be like the Dungey cycle," said Shaosui Xu, the study's lead author from UC Berkeley's Space Sciences Laboratory. The Dungey cycle is the process that powers Earth's auroras when the Sun's magnetic field lines connect with our planet's magnetosphere and launch charged particles into the atmosphere.

Scientists had observed localized auroras hovering over Mars' crustal magnetic fields before, similar to Earth's polar lights. But until now, they couldn't explain the physics of how electrons gained enough energy to create those glowing displays.

The research team pushed MAVEN's instruments to their limits to solve the puzzle. They combined data from the spacecraft's Magnetometer, Solar Wind Electron Analyzer, and STATIC instrument to build a complete picture of the magnetic behavior and plasma flows in Mars' ionosphere.

Why This Inspires

This discovery does more than explain pretty lights in the Martian sky. It reveals that the same fundamental physics can operate at vastly different scales throughout our solar system, opening new possibilities for where similar processes might occur.

The findings also help scientists understand how the solar environment strips away Mars' atmosphere, knowledge that's essential for planning future robotic and human missions to the Red Planet. Every piece of the puzzle brings us closer to safely exploring our planetary neighbor.

"This is a remarkable result that changes how we think of Martian auroras," said Shannon Curry, MAVEN's principal investigator at the University of Colorado Boulder. She noted how the discovery advances our understanding of why Mars and Earth evolved so differently despite following the same physical laws.

For Xu, the breakthrough felt especially meaningful. "I remember in graduate school discussing with my advisor how the cycling of crustal magnetic fields could work at Mars," he said. "It's incredible to be part of the team that found the answer to that question."

The MAVEN spacecraft lost contact with Earth in December 2025 and was declared unrecoverable in June, but its scientific legacy continues to illuminate our understanding of Mars.