For nearly 20 years, NASA’s Mars Reconnaissance Orbiter (MRO) has been a tireless eye in the sky, revolutionizing our understanding of the Red Planet. Now, engineers have taught this veteran spacecraft a surprising new maneuver – essentially flipping itself upside down – to give its radar instrument a clearer, deeper look beneath the Martian surface in the hunt for buried water ice or even liquid water. This innovative technique could unlock secrets about Mars’ watery past and its potential to host life.
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Key Takeaways:
- NASA’s MRO is using a new “upside-down” roll maneuver.
- This roll allows its radar instrument (SHARAD) to penetrate deeper and get clearer images.
- The goal is to find hidden water ice or potentially liquid water underground.
- The technique breathes new life into an aging spacecraft, demonstrating creative problem-solving in space exploration.
An Old Spacecraft, New Gymnastics
Launched in 2005, the Mars Reconnaissance Orbiter (MRO) is a cornerstone of Mars exploration. While it was designed with some flexibility to roll up to 30 degrees to point its various instruments, the latest trick involves rolling a dramatic 120 degrees. Imagine if your car had to turn completely sideways just to scan for speed bumps! This maneuver is complex, requiring careful planning by the mission team.
Why the extreme roll? MRO carries several powerful instruments, including the Shallow Radar (SHARAD) sounder, designed to peer beneath the Martian soil, much like ground-penetrating radar used here on Earth to find buried objects or underground structures. SHARAD can typically see down about half a mile to a mile deep, searching for signatures of ice or water hidden away from the harsh surface conditions.
Artist's illustration of the Mars Reconnaissance Orbiter in orbit around Mars, showing its solar panels extended.
Peering Deeper with Radar
While effective, the SHARAD instrument faces a challenge. It uses two antennas mounted towards the back of the spacecraft. This positioning is necessary to give instruments like the powerful HiRISE camera (which takes stunning, detailed images of the surface) a clear view looking forward. However, other parts of the spacecraft can sometimes block or interfere with the radar signals SHARAD sends out and receives back. This is similar to trying to listen for a faint sound with an obstruction in the way – the signal isn’t as clear.
By rolling the spacecraft 120 degrees, engineers can change the angle and position of the SHARAD antennas relative to the rest of the orbiter and the surface below. This adjustment minimizes interference, allowing the radar signal to reach the ground more effectively and bounce back with greater strength. Scientists say this boost can make the signal up to 10 times stronger, resulting in clearer radar images and potentially letting them see slightly deeper than before into promising target areas.
Gareth Morgan at the Planetary Science Institute, a lead author on the study published in The Planetary Science Journal, highlighted the significance of this new approach:
Not only can you teach an old spacecraft new tricks, you can open up entirely new regions of the subsurface to explore by doing so.
A Tricky Business
Executing these large, 120-degree rolls isn’t simple. It requires intricate planning weeks in advance. The spacecraft must perform a sequence of maneuvers, all while ensuring its solar panels can still track the sun for power and its high-gain antenna can maintain communication with Earth. These rolls also consume significant battery power. Reid Thomas, MRO’s project manager at NASA’s Jet Propulsion Laboratory, notes that such large rolls require special analysis to ensure there’s enough power onboard. Because of the complexity and power demands, these extreme rolls are only performed a few times a year on specific targets of interest.
Diagram showing the Mars Reconnaissance Orbiter with its instruments labeled and indicating the direction of flight and rolling capabilities.
The benefits extend beyond SHARAD. MRO also carries the Mars Climate Sounder, which studies the planet’s atmosphere. This instrument typically pivots independently, but after nearly 20 years in space, its pivoting mechanism has become less reliable. Now, the spacecraft’s standard rolling capability is used to help the Climate Sounder achieve its required viewing angles, demonstrating how the orbiter’s versatile design continues to support its mission in unexpected ways.
Unveiling What Lies Beneath
The search for water on Mars is fundamental to understanding its history, geology, and the possibility of past or present life. While plenty of water ice has been found near the poles and at certain latitudes, finding more widespread subsurface ice or even pockets of liquid water remains a key goal. Water ice buried underground could be a valuable resource for future human missions, and finding liquid water, however briny or deep, would have profound implications for astrobiology.
Radargram image from the SHARAD instrument on MRO showing a subsurface profile before the spacecraft performed the 120-degree roll maneuver.
Radargram image from the SHARAD instrument on MRO showing the same subsurface area after the 120-degree roll, displaying a clearer signal return.
These new “upside-down” observations using SHARAD are already providing clearer data from previously difficult-to-study regions. By creatively leveraging MRO’s existing capabilities in new ways, scientists are maximizing the scientific return from this long-serving spacecraft.
Continuing the Search
This innovative rolling technique allows MRO to continue its vital work in exploring the Martian subsurface with improved clarity and depth penetration. As the search for water and habitable environments on Mars continues, lessons learned from pushing the capabilities of veteran spacecraft like MRO will be invaluable for future missions. It’s a testament to the ingenuity of engineers and scientists that even after nearly two decades, this incredible orbiter is still learning and revealing new secrets about our planetary neighbor.
Gareth Morgan, a lead author of the study on MRO's rolling maneuvers, posing for a photo with trees and a sky background.
The data gathered from these enhanced SHARAD observations will help scientists refine their understanding of Mars’ subsurface structure and map potential water ice reservoirs. This persistent search reminds us that space exploration is not just about building new hardware, but also about finding clever ways to use the tools we already have to unlock the mysteries of the cosmos.
