Daily News Analysis ‘The Chandrayaan-2 Discovery: Lunar Sub-Surface Ice’ : 29 May

Why in News: 

  • Scientists analyzing data from India’s Chandrayaan-2 orbiter have discovered evidence pointing to the potential presence of water-ice hidden beneath the surface of craters at the Moon’s South Pole.

Key Facts: Chandrayaan-2 Mission Profile and Scientific Discovery

  • Mission Status: While the lander module experienced a hard landing, the Chandrayaan-2 orbiter remains fully functional in lunar orbit, continuously collecting and transmitting scientific data.
  • The DFSAR Payload: The discovery was made using the Dual Frequency Synthetic Aperture Radar, an instrument that transmits microwave signals to scan through darkness and penetrate the top layers of lunar soil (regolith).
  • Permanently Shadowed Regions (PSRs): The radar targeted deep impact craters that never receive direct sunlight or solar thermal radiation due to the specific tilt of the Moon’s rotational axis.
  • Extreme Cold Traps: Because these regions are completely shielded from the sun, ambient temperatures stay consistently below 25 Kelvin, acting as cryogenic freezers capable of preserving water-ice for billions of years.
  • Radar Signal Confirmation: Analysts from the Physical Research Laboratory detected unique microwave scattering signatures beneath the floors of four specific craters, indicating ice crystals mixed into the subsurface dirt.