Sandra Bullock to replace Natalie Portman in `Gravity`?

Updated: Oct 08, 2010, 12:11 PM IST

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

To be directed by Alfonso Cuaron, the film will revolve around two astronauts fighting to survive on a remote space station.