NASA's twin ESCAPADE spacecraft are finally on their way to Mars. Rocket Lab announced on Tuesday, November 10, that the two probes — nicknamed Blue and Gold — successfully fired their engines at the closest point of two flybys of Earth, using their home planet as a slingshot to hurl themselves toward the Red Planet. The maneuver, completed on November 7 and November 9, sets the pair on a ten-month cruise to Mars, where they will arrive in September 2027 to investigate how Mars lost its atmosphere, and with it, its water.
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| Artist's illustration of NASA's twin ESCAPADE spacecraft, Blue and Gold, near Mars. (Rocket Lab) |
The success caps a year of patient waiting in deep space. ESCAPADE — short for Escape and Plasma Acceleration and Dynamics Explorers — launched on November 13, 2025, from Cape Canaveral Space Force Station in Florida aboard a Blue Origin New Glenn rocket. But because Earth and Mars were not lined up for a direct trip, the two spacecraft did not head straight for the Red Planet. Instead, they spent nearly a year parked in a looping orbit around a gravitational balancing point in space, waiting for the planets to fall into alignment.
A Year Parked a Million Miles Away
The parking spot is known as the Sun-Earth Lagrange point 2, or L2, a region about 930,000 miles from Earth where the gravity of the Sun and Earth balance out. There, Blue and Gold traced a kidney-bean-shaped loop in space for almost twelve months while the geometry of the solar system slowly shifted into place.
The wait was not wasted time. According to Rocket Lab, which designed and built both spacecraft for NASA and the University of California, Berkeley's Space Sciences Laboratory, operators used the loiter phase to finish commissioning the probes and to carry out a series of small trajectory corrections. The path back toward Earth also carried the spacecraft through Earth's magnetotail, giving the science team an early chance to switch on its instruments before the real work at Mars begins.
The approach was a deliberate break from the usual rules of Mars travel. Most missions can only launch during narrow windows that open roughly every 26 months, when Earth and Mars line up for the most efficient transfer. ESCAPADE was built to escape that constraint: by waiting at L2 and then falling back toward Earth for a powered flyby, the mission decoupled its launch date from the planetary alignment — a trick that could give future low-cost missions far more flexibility in when they fly.
The Slingshot: Two Burns, Two Days
The critical moment came in two acts, 48 hours apart. On Friday, November 7, the Blue spacecraft swept past Earth and fired its engine at the closest point of its flyby. On Monday, November 9, Gold did the same. Each burn was a single, continuous firing of about ten minutes, performed autonomously while Rocket Lab and UC Berkeley operators watched from the ground.
What made the maneuver unusual is that the spacecraft did the job themselves. On a typical interplanetary mission, the launch vehicle's upper stage provides the push toward the destination. Blue and Gold had no such help. They had to light their own engines at precisely the right moment — at the point where they were moving fastest, deep in Earth's gravity well — to gain the maximum possible boost. The technique is known as a powered flyby, or Oberth maneuver, after the physicist Hermann Oberth, who described the idea nearly a century ago. According to reports, it had never before been attempted by a government-operated spacecraft.
The stakes were high. The trans-Mars injection burn is one of the two largest propulsive maneuvers of the entire mission — the other is the burn that will slow the spacecraft into orbit around Mars — and it could not be split into smaller pieces. Each spacecraft had to sustain one precisely controlled engine firing, with no room for a do-over. Rocket Lab said both burns were executed with much greater than 99 percent overall accuracy, with a final attitude error of less than one degree. "Next stop, Mars," said Sir Peter Beck, Rocket Lab's founder and chief executive, calling the flawless burns a testament to his team's execution and its collaboration with UC Berkeley and NASA.
The road to this week was not entirely smooth. According to reports, Gold's propulsion system produced lower thrust than expected during maneuvers in late 2025, delaying a critical correction. A replacement maneuver was completed on January 6, 2026, and controllers confirmed both spacecraft were back on their correct trajectories.
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| The twin ESCAPADE spacecraft, Blue and Gold, side by side during integration and testing at Rocket Lab. (Rocket Lab) |
Why Two Spacecraft Are Better Than One
Once they reach Mars, Blue and Gold will work as a team to answer a question that has puzzled scientists for decades. Billions of years ago, Mars is believed to have had a thick atmosphere and liquid water on its surface. Today its air is less than one percent as dense as Earth's, and its surface is a cold, dry desert. Much of that atmosphere is thought to have been stripped away by the solar wind, the stream of charged particles flowing out from the Sun.
The problem is that Mars has no global magnetic field like Earth's to deflect that wind. Instead, it has a strange patchwork of magnetic fields frozen into its crust, remnants of an ancient dynamo that died long ago. The result is what scientists call a hybrid magnetosphere, a complex magnetic environment that interacts with the solar wind in ways still poorly understood.
That is where the twins come in. Flying in formation along the same path — one following the other like pearls on a string, separated by two to thirty minutes — Blue and Gold will take simultaneous measurements from two points in space. That dual vantage point will let scientists tell the difference between changes happening over time and changes happening across space, a distinction a single spacecraft can never make on its own. Together, the pair will measure how the solar wind strips ions from the upper atmosphere, helping researchers reconstruct the history of Mars' atmospheric escape and characterize the planet's space weather.
The mission is the first planetary mission led by UC Berkeley, and its principal investigator is Robert Lillis of the university's Space Sciences Laboratory. The spacecraft take their nicknames from the university's school colors. The mission is also remarkably cheap by interplanetary standards, reported to cost under 80 million dollars — a fraction of the billion-dollar flagship missions that usually travel to Mars. Rocket Lab delivered both spacecraft three and a half years after the contract was awarded, building much of the hardware and software in-house.
What This Means
The success of the powered flybys matters for more than one mission. For NASA, it validates a new way of getting to Mars that could make future missions cheaper and less hostage to the calendar. A spacecraft that can launch whenever it is ready, wait in deep space, and then slingshot itself toward its target is a fundamentally more flexible tool than one tied to a launch window that opens for a few weeks every two years.
For planetary science, the payoff is a new kind of dataset. Mars' atmosphere did not vanish in a single event; it leaked away over billions of years, ion by ion, in a process that is still going on today. Watching that escape in real time, from two spacecraft at once, should give scientists their clearest picture yet of how a once-habitable world became the desert it is now — and what that history means for the search for ancient life on Mars. There is also a practical angle: any future astronauts who travel to Mars will have to live with the planet's space weather, and the data Blue and Gold collect will feed directly into planning for human exploration.
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| Technicians prepare the ESCAPADE spacecraft in a cleanroom ahead of the mission's launch in November 2025. (UC Berkeley) |
What Happens Next
The two spacecraft are now on a roughly ten-month cruise through interplanetary space, with small correction maneuvers refining each probe's path. The next great test comes in September 2027, when Blue and Gold must fire their engines again to slow down and slip into orbit around the Red Planet. That Mars orbit insertion is the mission's other major burn, and like the one just completed, it cannot be split into smaller pieces.
If that burn goes as well as this one did, the pair will settle into elliptical science orbits and begin easing into their first formation in 2028 — two small spacecraft, flying in tandem around another world, watching the solar wind steal pieces of its sky. For a mission that spent a year waiting a million miles from home, the long way around is finally paying off.
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