Sandra Bullock to Kick Asteroid in 'Gravity'?

[caption id="attachment_1844" align="alignleft" width="220" caption="MTV"]Sandra Bullock[/caption]

Add Sandra Bullock to the list of actresses who have been sucked in by "Gravity." The Oscar winner is the latest A-lister attached to the hot sci-fi flick, according to the Hollywood Reporter.

The $80 million, 3-D film, directed and co-written by Alfonso Cuaron ("Y Tu Mama También"), is set to star Robert Downey Jr. but has yet to land a leading lady.

Warner Bros. reportedly began negotiating with Bullock – who would play an astronaut battling deadly space debris in an effort to return to her daughter on Earth -- after talks with Natalie Portman hit a few bumps.

The out-of-this-world project was originally developed for Angelina Jolie, but she dropped out after the studio refused to pay her $20 million, according to the Hollywood Reporter.

After that, everyone from Marion Cotillard, Scarlett Johansson, and Blake Lively threw their hats into the, er, Saturn rings. Then Jolie expressed interest a second time, before passing on the movie again.

Portman became Warner's next choice, partly because of the Oscar buzz building around her upcoming psychological drama "Black Swan." Deadline.com reports that she was offered the female lead in "Gravity" but ultimately turned it down.

Will new mom Bullock rise to the challenge of playing a woman who will kick asteroid to be with her kid? Stay tuned…