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Robert Downey Jr is reportedly close to securing the lead role in Alfonso Cuarón's new 3D science-fiction film Gravity.

According to reports, the actor is now the frontrunner to play an astronaut leading a team based on a remote space station.

After the outpost is struck by an off-course satellite, the entire crew is killed leaving just Downey Jr's character and a female colleague stuck in space.

Angelina Jolie was initially linked with the female lead, but she dropped out when Warner Bros took over the project from Universal.

Harry Potter and the Prisoner of Azkaban director Cuarón has written the script with his son Jonás, with filming due to start in London in the summer.