- Why in news
- On 16 October 2026, the Ministry of Science & Technology reported that University of Kerala scientists identified two sulphate minerals in Tamil Nadu and Chile's Atacama Desert. These help establish the sites as Martian analogues.
- What it is
- A Martian analogue site is a place on Earth whose geology, chemistry or physical conditions resemble those of Mars. Scientists study such sites to interpret Martian minerals, past water activity and possible habitability. Orbital data alone cannot fully characterise Martian minerals, so ground-based work on analogues is needed.
- Minerals found
- Melanterite was identified at Neyveli, and gypsum at the Tiruchirappalli Badlands and the Atacama Desert. Both are hydrous sulphates that record water-rock interactions.
- What each mineral shows
- Gypsum preserves evidence of past aqueous environments, while melanterite indicates short-lived wet, acidic and oxidizing conditions.
- Instrument used
- A laser Raman spectrometer detected the spectral fingerprints of the minerals. It is supported by DST-FIST at the Department of Geology, University of Kerala.
- Biosignature link
- Gypsum can preserve biosignatures within its mineral matrix, which makes it useful for astrobiology.
- Publication
- The findings appeared as two papers in the Journal of Geophysical Research: Planets.
- DST-FIST
- Fund for Improvement of S&T Infrastructure (FIST) is a Department of Science and Technology programme that supports research infrastructure in universities and institutions.
Don’t confuse with Analogue site vs. mission: An analogue site is a place on Earth used to study Mars-like conditions. A mission sends a spacecraft to Mars itself.
Don’t confuse with Melanterite vs. gypsum: Melanterite is an iron sulphate that forms by sulphide oxidation. Gypsum is a calcium sulphate that records past water activity.
Science and technology: 57 Prelims questions since 2013; most test the concept behind the news, not the news itself. In Mains, 12 news-triggered questions.
Why it matters
- Analogue sites help interpret Martian mineral data and guide future missions to promising places in the search for life.
- Domestic analogue sites such as Tamil Nadu's give India local sites for planetary science research.
Problems
- Orbital data alone cannot fully characterise Martian minerals, and advanced instruments are needed to study them.
- Analogue sites match Mars only in some respects, so their findings need cross-checking.
Way forward
- Extend studies to rare analogue sites in extreme conditions, using the same facility.
- Link analogue findings with planetary missions and shared instrument facilities.
Put in your answer
Analogue site example: Neyveli, the Tiruchirappalli Badlands and the Atacama Desert are cited as Martian analogue sites based on sulphate minerals.
Infrastructure support: DST-FIST-funded instruments, such as the laser Raman facility at the University of Kerala, enabled advanced planetary science research.
No close past question yet.
No practice question for this one; the card may still help an answer. Why: Concept of analogue sites and minerals is syllabus-relevant. Science and tech makes up 17% of news-linked Prelims questions, but this research finding is a niche one.
Worth revising until Prelims 2028: most news questions come within two years of the event.