Science and technology

Introduction and Overview of ChaSTE

  • ChaSTE, an acronym for Chandra's Surface Thermophysical Experiment, is a groundbreaking instrument deployed by India's Chandrayaan-3 mission.
  • Its primary achievement is being acknowledged as the first-ever tool to successfully measure subsurface temperature in the vicinity of the Moon's south pole.
  • The instrument was effectively deployed by the Vikram lander in August 2023, subsequent to Chandrayaan-3's triumphant lunar landing.
  • The configuration of the ChaSTE probe consists of 10 temperature sensors, each spaced 1 cm apart along its needle. The probe deploy method is rotation-based rather than hammer-based.

 

Findings and Significance

  • ChaSTE successfully delved up to 10 cm into the lunar exterior, collecting thermal data until September 2023.
  • The data culminated in a critical revelation — the existence of more water ice near the south pole than what was initially hypothesised. This discovery holds immense weight for prospective lunar expeditions.
  • The success of ChaSTE is principally ascribed to its rotating probe mechanism, which showed greater efficiency than the hammering methods utilised by previous expeditions.

 

Comparison with Previous Missions

  • In comparison, the European Space Agency's Philae lander in 2014 was unable to deploy its MUPUS (Multi-Purpose Sensors for Surface and Subsurface Science) thermal probe due to a problematic landing on comet 67P.
  • Similarly, NASA’s InSight mission in 2018, aimed towards Mars, was unable to accumulate subsurface data owing to mechanical complications with the Heat Flow and Physical Properties Package (HP3) instrument.
  • Thus, the success of ChaSTE demonstrates a significant leap forward in lunar exploration technology.

 

Implications for Future Missions

  • The accomplishments of ChaSTE imply promising prospects for future space missions.
  • The superior performance of the rotational deployment method in extreme lunar conditions may change the preferred probe deploy techniques in future explorations.
  • Furthermore, the newly discovered availability of water ice could be instrumental for future manned missions, enabling moon-based water supply and potential fuel production.