NASA loses touch with MAVEN craft which reached Mars just before Mangalyaan, PgII

Key Highlights:

• NASA lost contact with the MAVEN spacecraft in early December 2025, which has been studying Mars' atmosphere for over a decade.
• MAVEN was launched in November 2013 and entered Mars orbit in September 2014.
• The spacecraft measures the upper atmosphere and ionosphere of Mars to understand the planet's atmospheric escape.
• MAVEN also serves as a relay for communications between Earth and Mars rovers like Curiosity and Perseverance.
• NASA is investigating the cause of the communication loss, with a possible clue indicating unexpected rotation and orbit change.
• Other orbiters like the Mars Reconnaissance Orbiter and Mars Odyssey are handling relay duties in MAVEN's absence.
• India's Mars Orbiter Mission (MOM), or Mangalyaan, reached Mars orbit shortly after MAVEN in September 2014.

Detailed Insights:

• MAVEN's primary mission was to study how sunlight and solar wind interact with the Martian atmosphere, helping scientists understand Mars' transformation from a potentially habitable planet to its current state.
• The spacecraft's last complete data transmission occurred on December 4, 2025, before it passed behind Mars on December 6, after which its signal was not reacquired.
• A brief fragment of tracking data suggests MAVEN may be rotating unexpectedly and its orbit may have shifted, though the cause is still unknown.
• While MOM was often compared to MAVEN due to its lower cost, MAVEN was designed as a more technically advanced science mission with different objectives and payloads.
• MAVEN's extended mission has provided a long-term record of the Martian upper atmosphere's response to solar activity, contributing significantly to our understanding of Mars.
• The loss of MAVEN's signal has led NASA to redistribute relay communication tasks to other Mars orbiters and coordinate with European missions to maintain rover communication.

Scientific/Technical Concepts Involved:

• Ionosphere: The layer of a planet's atmosphere containing a high concentration of ions and free electrons, and is able to reflect radio waves.
• Solar Wind: A stream of charged particles released from the upper atmosphere of the Sun.
• UHF (Ultra-High Frequency): Radio frequencies in the range of 300 MHz to 3 GHz, commonly used for short-distance communication.