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Chandrayan 2 found Argon 40 in lunar Space

Chandrayaan 2 found Argon 40 in lunar space :-

The Indian Space Agency, Indian Space Research Organisation (ISRO), reported that Chandra's Atmospheric Composition Explorer-2 (CHACE-2) payload on Chandray.                                                      

The Indian Space Agency, Indian Space Research Organisation (ISRO), reported that Chandra's Atmospheric Composition Explorer-2 (CHACE-2) payload on Chandrayaan-2 detected Argon-40 (40Ar) from the lunar exosphere. Among the radiogenic gases present on the surface of the Moon, 40Ar is one of the isotopes of Argon, which is a noble gas. The detection of 40Ar in the lunar exosphere is significant for ISRO as it has a high escape rate.

Argon in Moon:

Argon is an important component of the exosphere of Moon. It originates from the radioactive disintegration of Potassium-40 (40K). 40k has a half-life of 1.2X109 years. 
40K nuclide is present deep below the lunar surface. It gets disintegrated to 40Ar, which makes way up to the lunar exosphere through seepages and faults. 40Ar escapes from Moon at a high rate between 3% and 6%.