Scientists at the Indian Space Research Organisation (Isro) reckon they will need $1.28bn (£1.01bn) to fulfil Mr Modi's challenge - and they think they can launch the flight within 40 months. There are many reasons why they believe it can be done. They hope to use the country's heaviest rocket - the Geosynchronous Satellite Launch Vehicle Mark III or GSLV Mk-III - for the space flight.
This 640-tonne, 43-metre tall rocket was launched successfully in 2017. The coverage of the launch was euphoric, and often colourful, with websites comparing the rocket to the weight of 200 elephants or five jumbo jets. This rocket can launch 10 tonnes of payload into low-Earth orbit- an altitude of 2,000km (1,200 miles) or less above the planet - which is more than enough to send a crew into space, say scientists. With some modifications, the launch pad from a site off the Bay of Bengal can easily be used to launch astronauts, they say.
https://www.bbc.com/news/world-asia-india-45243908
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