Context: NASA’s Mars rover Perseverance (exploring the Martian surface since 2021) has found the strongest signs yet that some form of life may have existed on Mars in the past.
Relevance of the Topic: Prelims: NASA’s Mars rover Perseverance findings; NASA’s Perseverance Mission.

Perseverance’s Finding:
- NASA's Perseverance rover discovered leopard spots on a reddish rock nicknamed “Cheyava Falls” in Mars' Jezero Crater in 2024.
- The rock was found to contain clay and silt, which are known on Earth to preserve microbial life effectively.
- The analysis also revealed the presence of organic carbon, sulphur, oxidised iron (rust), and phosphorus.
- These minerals could have formed through biological activity but may also have resulted from purely chemical, non-biological processes.
- The rock sample has been described as containing a “potential biosignature”, but not yet confirmed as evidence of life.
What are Biosignatures?
- Biosignatures are objects, structures, or chemical compositions that may have a biological origin. They indicate the possible presence or activity of living organisms, either in the past or present.
- A biosignature is any substance such as an element, isotope, or molecule or phenomenon that provides scientific evidence of past or present life.
Significance of the Finding
- This is the closest NASA has ever come to detecting signs of life on Mars.
- The discovery has the potential to revolutionise our understanding of Mars’s history and its capacity to host life.
- The clay-rich nature of the sample is particularly important, as clay is known to be an excellent preserver of microbial signatures on Earth.
However, the finding does not conclusively prove the existence of life on Mars. The structures and chemical compositions detected could also be explained by non-living (abiotic) processes.
NASA’s Perseverance Mission (Mars 2020 Mission)
- Launched: 2020. Landed in Mars: Feb 2021
- Rover: NASA’s 4th generation Mars Rover. It is the most advanced, most expensive & most sophisticated mobile laboratory sent to Mars till date. It is different from previous missions as it can drill & collect core samples of most promising rocks & soils. The rover landed at Jezero Crater - an ancient river delta that has rocks and minerals that could only form in water.
- Ingenuity Helicopter: Autonomous helicopter that operated on Mars till January 2024. Travelled to Mars attached to the belly of the Perseverance rover and was deployed to the surface after landing in Jezero Crater. First aircraft to conduct a powered and controlled extra-terrestrial flight on a planet after Earth.
- Objectives:
- To look for biosignatures in either the chemical measurements or morphological observations, in the dried-up lakebed at Jezero Crater.
- To demonstrate technology for future robotic and human exploration. Perseverance will produce oxygen on the Martian surface for the first time, using atmospheric CO2 from the Martian atmosphere.
- Perseverance will drill and collect rock samples that will be returned to Earth by a subsequent European Space Agency/NASA mission in 2030s. Perseverance carries the Radar Imager for Mars’ Subsurface Experiment (RIMFAX). RIMFAX will provide high resolution mapping of the subsurface structure at the landing site.
- Power source: It has a Multi-Mission Radioisotope Thermoelectric Generator (MMRTG) which converts heat from the natural radioactive decay of plutonium (Plutonium Dioxide) into electricity.




