Panaji, Sep 2 - Three days after the Indian Space Research Organisation (ISRO) admitted the abrupt end of its Chandrayaan-1 mission, a leading US-based scientist associated with the project Wednesday termed it 'a complete success', but added that 'what we have not achieved is our ultimate goal, which was a much more extended mission that was to be achieved during the full two years'.

Speaking to reporters here on the sidelines of an ISRO-sponsored conference, Carle Pieters, science manager at the NASA-supported spectrology facility at the Brown University in the US, said: 'I think it's a complete success.'

'The achievements are very difficult to accomplish.