A Mission to Understand Mars' Lost Atmosphere

Mars transformed from a potentially habitable world billions of years ago to the frozen desert we see today. Scientists believe solar wind erosion played the key role in stripping away the planet's atmosphere. NASA's new ESCAPADE mission aims to solve this mystery.

The Twin Spacecraft Advantage

ESCAPADE (Escape and Plasma Acceleration and Dynamics Explorers) stands out because it uses two spacecraft working together in orbit around Mars. This coordinated approach allows scientists to observe the planet's magnetic environment from two locations simultaneously—something a single spacecraft cannot achieve.

"Having two spacecraft is going to help us understand cause and effect," explains Michele Cash, ESCAPADE program scientist at NASA Headquarters. "When we have two spacecraft crossing those regions in quick succession, we can monitor how those regions vary on timescales as short as two minutes."

Stereo Vision of a Planetary Transformation

The mission principal investigator Rob Lillis describes the mission as providing a "stereo perspective"—two different vantage points simultaneously observing the solar wind's interaction with Mars' magnetic field. This dual observation enables researchers to measure processes that were previously impossible to detect.

After approximately six months of flying identical orbital paths, the spacecraft will separate into different orbits. One will remain closer to Mars while the other travels farther away, allowing simultaneous observation of both the incoming solar wind and Mars' response within its magnetosphere.

Preparing for Human Missions

The data gathered will help NASA better protect future astronauts exploring Mars. Earth's strong global magnetic field shields our planet from solar radiation, but Mars—with its weakened field and thin atmosphere—provides little protection. Understanding these conditions is essential before sending humans to the Red Planet.

Additionally, ESCAPADE will study the Martian ionosphere, which future astronauts will rely on for communications and navigation systems similar to those used on Earth.

An Unconventional Route

Rather than launching during the typical Mars launch window, ESCAPADE took a novel approach: the spacecraft are currently looping around Lagrange Point 2 (about a million miles from Earth) and will swing back past Earth in November 2026 to use our planet's gravity for propulsion toward Mars. The mission is expected to arrive in September 2027.

During this extended journey, the spacecraft will conduct discovery science in Earth's distant magnetotail—a region no spacecraft has measured at such distances before.

Source: NASA ESCAPADE Mission