ESA's Proba-3 mission, launched by ISRO, will study the Sun’s corona with innovative formation flying technology.

ESA revealed that the choice of PSLV was strategic — it offers the perfect balance of capability and cost for the Proba-3 mission, which involves a payload of 550 kg. The payload will involve two satellites that are part of the payload,

The Proba-3 satellite will be launched by the Indian Space Research Organisation (Isro) aboard the Polar Satellite Launch vehicle (PSLV) on December 4.

The European Space Agency admitted that ISRO's PSLV is a more cost-effective alternative to its own heavy-lift Ariane-6 and medium-lift Vega-C rockets. The three instruments onboard Proba-3 will help unravel the scientific mystery of why the solar corona is significantly hotter than the sun itself.

ISRO will launch the Proba-3 mission next Wednesday. Two satellites will fly 150 meters apart. One satellite will block the Sun's light. The other sat