NASA just sent two small spacecraft toward Mars to answer a question that's haunted planetary scientists for decades: where did all the water go?
The ESCAPADE mission—short for Escape and Plasma Acceleration and Dynamics Explorers—lifted off from Cape Canaveral on a Blue Origin New Glenn rocket, carrying twin spacecraft built by Rocket Lab. Over the next decade, these two satellites will investigate how the solar wind, that constant stream of charged particles flowing from the sun, has gradually stripped away Mars' atmosphere. The result is a planet that cooled, lost its magnetic protection, and watched its surface water evaporate into space.
This isn't abstract astronomy. Understanding what happened to Mars' atmosphere matters because it shapes how we prepare to send humans there. Future astronauts will need to know how the planet's upper atmosphere behaves, how it interacts with radiation from space, and where the radio and navigation signals they depend on will travel.
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Start Your News DetoxA New Way to Watch a Planet
When ESCAPADE arrives in September 2027, it will do something no mission has done before: two spacecraft will enter orbit around another planet in a coordinated formation. For the first six months, they'll fly in what scientists call a "string-of-pearls" pattern—passing through the same region of space just minutes apart. This lets them measure how conditions change in short bursts of time, like catching the same movie scene from two different angles.
Then the real work begins. One spacecraft will drift farther from Mars while the other stays close, allowing the pair to observe the solar wind and Mars' upper atmosphere simultaneously from different vantage points. It's stereo vision for planetary science. They'll watch in real time how Mars responds to the solar wind's pressure and energy, building a three-dimensional picture of a process that's been invisible until now.
The mission is led by UC Berkeley and funded through NASA's Heliophysics Division, part of a broader effort to understand Mars' past and present before humans arrive. In a way, these two small satellites are scouts—gathering intelligence about an ancient planetary catastrophe so we know what we're walking into when we finally get there.
The wait begins: ten months of cruising through space, then a decade of watching an entire planet's story unfold.
