Sandra Bullock to replace Natalie Portman in `Gravity`?

London: Actress Sandra Bullock is reportedly set to join Robert Downey, Jr in the sci-fi thriller ‘Gravity’.

Natalie Portman had been linked to the role, but was forced to pull out due to date problems. Angelina Jolie had originally committed to work in the upcoming USD84 million 3D movie, reports dailystar.co.uk. To be directed by Alfonso Cuaron, the film will revolve around two astronauts fighting to survive on a remote space station. IANS