India, July 16 -- The Indian Space Research Organisation (ISRO) has reportedly been hit by mass resignations with with at least 100 scientists putting in their papers in recent months, prompting Centre to step in to tighten rules on voluntary exits and retirement, especially for those working on critical missions such as Gaganyaan.

Centre has directed Isro centres not to accept resignation or voluntary retirement requests from Group 'A' scientific and technical personnel associated with Gaganyaan and other key missions, according to an internal document issued on July 14, accessed by India Today.

The memorandum further adds that all requests for resignation and retirement will now be referred to the Department of Space.

As per media re...