Why in news?  ISRO has successfully conducted the flight acceptance hot test of the CE-20 cryogenic engine for Chandrayaan 3 .

CE20

• Power the Cryogenic Upper Stage of the LVM3 launch vehicle for the Chandrayaan-3 mission
• Tested at the ISRO Propulsion Complex, Mahendragiri in Tamil Nadu.
• Will further be integrated with the propellant tanks, stage structures and associated fluid lines to realise the fully integrated flight cryogenic stage
• First Indian cryogenic engine to feature a gas-generator cycle

CRYOGENICS

• A cryogenic rocket engine is a rocket engine that uses a cryogenic fuel and oxidizer that is, both its fuel and oxidizer are gases which have been liquefied and are stored at very low temperatures.
• The United States, Russia, Japan, India, France and China are the only countries that have operational cryogenic rocket engines

CHANDRAYAAN 3

• The Chandrayaan-3 interplanetary mission has three major modules — propulsion, lander and rover modules. The mission’s complexity calls for establishing radio-frequency (RF) communication links between the modules.
• Chandrayaan-3 is India’s third moon mission and is a follow-on mission to Chandrayaan-2 to demonstrate end-to-end capability in safe landing and roving on the lunar surface
• Aims to study lunar South Pole
• The mission is slated to be launched later this year by Launch Vehicle Mark 3 (LMV3) from the Satish Dhawan Space Centre at Sriharikota