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NASA Announces Twin Low-Cost Orbiters to Unlock Mars Atmosphere Secrets

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  Published in Science and Technology on Sunday, November 16th 2025 at 16:35 GMT by PBS

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NASA’s Latest Escapade: Twin Low‑Cost Orbiters Set to Unlock the Secrets of Mars’ Atmosphere

In a bold move that could reshape how we study the Red Planet, NASA has announced plans to launch two inexpensive orbiters—each costing less than a quarter of a billion dollars—to Mars. The twin spacecraft, slated to depart on a Falcon 9 launch vehicle in late 2025, will circle the planet and perform detailed measurements of its tenuous atmosphere. The project, a partnership between NASA’s Science Mission Directorate and the Jet Propulsion Laboratory (JPL), exemplifies the agency’s push toward “small, cheap, and clever” missions that can complement the expensive flagship missions currently orbiting Mars.

Mission Overview

The twin orbiters, provisionally named Mars Atmosphere Explorer (MAE‑1) and Mars Atmosphere Explorer‑B (MAE‑2), are being designed to orbit Mars at altitudes between 300 and 400 km. Their primary objective is to map the composition, temperature, and dynamics of the planet’s upper atmosphere and ionosphere. By measuring the densities of rare gases such as argon and helium, as well as the rate at which hydrogen escapes into space, scientists hope to understand how Mars has lost much of its atmosphere over billions of years—a key question for both planetary science and the future of human exploration.

The dual‑orbiter configuration will enable simultaneous, cross‑calibrated observations. While MAE‑1 will carry a suite of spectrometers and a plasma wave detector, MAE‑2 will be equipped with an ultraviolet imaging spectrograph and a mass spectrometer that can detect trace gases. The redundancy inherent in having two identical platforms allows for continuous data collection even if one instrument fails or experiences degradation.

Design and Cost

Each orbiter will weigh just under 120 kg and will be constructed from lightweight composite materials. The spacecraft will use a standard “CubeSat‑class” bus that NASA has successfully deployed on other planetary missions, such as the Dawn probe’s Miniaturized Radiation Detectors. By leveraging off‑the‑shelf components and a proven propulsion architecture, the design team expects to keep the cost of each orbiter under $80 million, including launch services. This puts the twin‑orbiter mission in the same price range as a single, mid‑size Mars lander—a dramatic reduction compared to the $850 million cost of the Mars 2020 Perseverance rover.

The spacecraft will be powered by deployable solar panels that can supply up to 120 W of power at periapsis. A small, low‑thrust electric propulsion system will allow the orbiters to maintain a stable orbit over a five‑year mission lifetime and to perform seasonal drift corrections. Their attitude control system will rely on reaction wheels and a magnetometer for fine pointing, ensuring that the ultraviolet spectrograph can be locked onto the solar limb with milliarcsecond accuracy.

Launch and Mission Profile

NASA has scheduled the launch on an Atlas V‑551 rocket from Cape Canaveral’s SLC‑41. The dual payload will be integrated into a “stacked” configuration, with the two orbiters riding side‑by‑side on a common fairing. Once the rocket has achieved trans‑Mars injection, the orbiters will perform a Mars‑entry, descent, and orbit insertion (EDOI) burn powered by a small solid‑fuel motor. The EDOI burn will drop them into a 400‑km circular orbit, after which they will begin their scientific operations.

Both spacecraft will begin their science phase during the first Martian sol after EDOI. They will be operational for at least three Martian years, with a planned extension to five years pending instrument performance and mission budget. The orbiters will transmit their data back to Earth via X‑band downlinks to NASA’s Deep Space Network (DSN) at Goldstone, Canberra, and Madrid.

Science Goals

NASA’s Mars Atmosphere Explorer mission aims to answer several fundamental questions:

1. Atmospheric Escape Mechanisms
   By measuring the loss rate of hydrogen and heavier ions, scientists will refine models of how Mars lost its primordial water reservoir and became a cold, dry world.

2. Temporal Variability
   The twin orbiters will observe seasonal changes in temperature and wind patterns in the upper atmosphere, providing insight into the coupling between the atmosphere and the planet’s surface.

3. Space Weather Effects
   The mission will monitor how solar storms influence the Martian ionosphere, a critical consideration for future human missions that might need to protect habitats from radiation.

4. Comparison with MAVEN
   NASA’s flagship Mars Atmosphere and Volatile Evolution (MAVEN) orbiter has been mapping the planet’s upper atmosphere since 2014. MAE‑1 and MAE‑2 will complement MAVEN’s measurements by providing higher‑resolution data at specific altitudes and over extended periods, allowing cross‑calibration of instruments.

Broader Implications for Human Exploration

A key driver behind the twin‑orbiter concept is its potential to inform future human missions to Mars. Understanding the ionospheric density and composition is essential for designing spacecraft that can safely navigate through the Martian sky. Moreover, the data on atmospheric escape will help assess the longevity of potential in‑situ resource utilization, such as extracting water from the atmosphere.

The mission also serves as a testbed for the “low‑cost” approach to deep‑space exploration. By demonstrating that a small, robust spacecraft can conduct sophisticated atmospheric science, NASA hopes to open the door for a new class of missions that are quicker to develop, less risky, and more frequent.

Looking Ahead

As the project moves from design to procurement, NASA’s public‑facing science pages—particularly the Science section on the official NASA website—will provide frequent updates on instrument selection, budget approvals, and launch windows. The twin orbiters will likely appear on the same “Next Steps” timeline that lists the Mars 2020 rover’s operations and the James Webb Space Telescope’s deployment schedule.

In sum, NASA’s twin low‑cost orbiters represent an elegant blend of cost‑efficiency and scientific ambition. By placing two small, high‑performance platforms into Mars orbit, the agency can dramatically increase our understanding of the planet’s atmospheric evolution while paving the way for humanity’s next giant leap.