As NASA attempts to reestablish contact with MAVEN, here's a look back at the spacecraft's key achievements

One of the biggest challenges NASA is facing is the failure to communicate with its MAVEN spacecraft, which fell silent in early December. The orbiter lost its connection to the agency on December 6 when it orbited behind Mars, and the most recent comments from NASA point to a challenging recovery process. 

Telemetry from the spacecraft showed that every system was working fine before it reached behind Mars. However, when Maven emerged again, NASA’s system of radio antennas on and orbiting around Earth (Deep Space Network) did not find a signal, except for a brief fragment of tracking data from December 6. Initial evaluation hints at the possibility that MAVEN may have been erratically spinning when it became visible again. Also, the signal's frequency suggests that the movement of the spacecraft may have been altered. Currently, the engineers are dividing the limited tracking data into smaller parts to determine the cause of the failure and are continuing their efforts to establish a strong connection again. While teams work to save the mission, here is a look at the major scientific milestones MAVEN has achieved since its launch. 

Mars water loss decoded 

In one breakthrough, MAVEN and the Hubble Space Telescope showed how Mars was robbed of its water: sunlight breaks down water molecules in the lower atmosphere, allowing hydrogen to rise and leak into space. This proved that atmospheric loss happens much more quickly when Mars is closer to the Sun, an important reason the planet turned into a desert, per NASA. 

The physics of "atmospheric sputtering"

MAVEN provided the first direct evidence for a process called "sputtering." That, according to NASA, is when high-speed ions of solar winds slam into the Martian atmosphere and physically knock atoms out into the void of space. The discovery confirmed one of the major reasons Mars lost its thick protective atmosphere billions of years ago. 

Global ultraviolet mapping 

The spacecraft used its specialized ultraviolet camera to create striking, global maps of Mars over the course of the changing seasons. By viewing the planet in wavelengths that are invisible to the human eye, MAVEN followed the shifting "nightglow" gases and watched polar ice caps grow and shrink dramatically, shared NASA. 

Probing the mystery of Phobos 

During a series of high-speed flybys, MAVEN came within 300 kilometers of the Martian moon, Phobos. According to the agency, the mission’s ultraviolet scans allowed researchers to hunt for organic molecules and compare the moon’s chemistry to both Mars and nearby asteroids, helping to determine whether the moon was an asteroid "captured" by gravity or a piece of the planet itself. 

Interstellar visitor observations

The orbiter played a crucial role in studying the extrasolar system comet 3I/ATLAS. MAVEN provided a very rare view of how different the composition of interstellar objects is from the ice and dust in our own solar system by capturing ultraviolet data as the comet sped past Mars, per NASA. 

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