Mumbai: Bollywood actor-producer Aamir Khan neither confirmed nor denied news that he may have signed up to feature in a biopic on India's first astronaut Rakesh Sharma. When asked if he has signed a new film which is about the life of the celebrated astronaut who ventured into space in 1984, Aamir said here: “I have not signed any film yet. I have just begun to read scripts and explore the possibility." "Until I sign a film I can’t tell you (the media) because it’s not fair. There are lot of people approaching me and they are approaching me with confidence, I will not let them down,” he added. Aamir said he follows a policy of keeping mum about his projects until everything is in order. “If someone narrates a script to me, I don’t tell anyone about it. If I don’t do it, then they say Aamir has rejected that film. I don’t want that... it’s not fair. Whichever script I hear, one will never come to know about it. I will neither deny nor admit to your question,” he said at the poster launch of his upcoming film "Dangal".