By Grace TurnerTwo refrigerator-sized interplanetary probes are preparing to execute an unprecedented ESCAPADE Mars gravity assist on November 7 and November 9, 2026. Combining Earth’s gravitational pull with a nine-minute rocket engine burn at closest approach, the twin Escape and Plasma Acceleration and Dynamics Explorers will slingshot themselves on a 10-month cruise toward the Red Planet.
While previous deep-space missions have used unpowered planetary flybys to adjust their trajectories, no Mars-bound spacecraft has ever performed a powered Earth flyby, known in orbital mechanics as an Oberth maneuver. Firing onboard thrusters at peak gravitational velocity maximizes kinetic energy gain and propels both probes onto their interplanetary transfer track.
The first spacecraft will begin its trans-Mars injection burn at 4:51 a.m. EST on Saturday, November 7, followed by its twin at 5:51 a.m. EST on Monday, November 9. Each burn will take place between 600 and 1,100 miles above Earth’s surface over southern Australia, boosting spacecraft velocity by more than 1,000 miles per hour—from roughly 6.3 to 6.7 miles per second, or Mach 31.
Pioneering a Flexible Loiter Route to Mars
Traditional Mars missions must launch within a narrow alignment window that opens only once every 26 months. However, the twin probes launched in November 2025 when Earth and Mars were positioned on opposite sides of the Sun, demonstrating a new flexible launch architecture developed with Advanced Space and Rocket Lab.
Instead of departing directly into deep space, the spacecraft flew a kidney-bean-shaped loop around the Earth-Sun Lagrange point 2 before returning to Earth just as the planetary alignment window opened. That 12-month loiter loop also allowed scientific instruments to collect bonus measurements inside a distant, previously unexplored region of Earth’s stretched magnetotail.
Key milestones for the upcoming Earth flyby and Mars transit include:
- Executing nine-minute engine burns on November 7 and November 9, 2026, visible through telescopes across western North America and Australia.
- Cruising for 10 months across interplanetary space with periodic trajectory correction maneuvers to refine their approach.
- Arriving in Martian orbit on September 7 and September 9, 2027, to begin coordinated dual-spacecraft science operations.
Studying Solar Wind and Martian Atmospheric Loss
In the hours leading up to their engine burns, skywatchers equipped with telescopes across the western United States will have an opportunity to spot the faint spacecraft gliding slowly from east to west overhead. The first probe is projected to appear brightest between midnight and 1:00 a.m. PST on November 7, while the second will peak between 1:00 a.m. and 2:00 a.m. PST on November 9.
Managed by the Space Sciences Laboratory at the University of California, Berkeley, under principal investigator Rob Lillis and built by Rocket Lab in Long Beach, California, the mission will become the first multi-spacecraft fleet to fly in formation around Mars. Simultaneous observations from two vantage points will map how the million-mile-per-hour solar wind interacts with the planet’s hybrid magnetosphere.
By tracking real-time particle flows and electromagnetic energy transfer, researchers aim to determine how space weather stripped away Mars’ ancient atmosphere and surface water. For readers following interplanetary exploration in our Top News section, the maneuver sets a new benchmark for low-cost planetary missions that no longer need to wait for rigid 26-month launch calendars.
