Scientists from the Physical Research Laboratory (PRL) have used mineralogical data from Chandrayaan‑1 to identify the Australe Basin, a previously unrecognized impact site in the Moon’s southeastern hemisphere that may predate the famous South Pole Aitken Basin. The finding offers fresh insights into lunar geology and informs future sample‑return missions.

  • Australe Basin could be the Moon’s oldest known crater.
  • Its magnesium‑rich basalt composition sets it apart from the South Pole Aitken Basin.
  • Discovery provides a new target for upcoming lunar sample‑return missions.

While roughly 300 impact basins are estimated to exist on the Moon, only 74 have been identified to date. A team from the Physical Research Laboratory (PRL), Ahmedabad, leveraged Chandrayaan‑1’s mineralogical data to uncover the hidden Australe Basin in the Moon’s southeastern hemisphere, a feature obscured by extensive rim erosion that made it invisible to conventional imaging.

The breakthrough came through the Moon Mineralogy Mapper (M3) aboard Chandrayaan‑1, an imaging spectrometer operating between 405 and 3000 nm. By analyzing absorption bands of key lunar minerals—pyroxenes, olivine, and plagioclase—researchers mapped the basin’s distinct mineralogy.

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Why This Matters

Australe’s magnesium‑rich basaltic lithology differs from the calcium‑rich basalts typical of most lunar craters, suggesting a different formation history. Dr. Neha Panwar, lead author, noted,

“This basin offers a framework to interpret data from future landing sites and could guide sample‑return missions.”

The study also links material from the South Pole Aitken Basin to the nearby Shiv Shakti landing site, hinting at a shared geological heritage across the Moon’s polar regions. Understanding these processes is crucial as missions like Chandrayaan‑4 and NASA’s Moon Base plan to target these areas.

Did You Know? Although 300+ impact basins are theorized, only 74 have been confirmed—showing how many lunar features remain hidden.

Frequently Asked Questions

1. How old is the Australe Basin?
The basin may be older than 4 billion years, potentially surpassing the South Pole Aitken Basin’s age.

2. What implications does this have for future missions?
Identifying this basin adds a promising target for sample‑return missions and enhances our understanding of lunar geology.