Natalie Portman will not be starring in the upcoming Warner Bros. 3D project Gravity, according to Deadline New York.

We reported last week that Natalie Portman was in negotiations to star in the Alfonso Cuarón sci-fi thriller, but this new report indicates that she has passed on the project. It wasn't clear if negotiations fell through, or if she was ever actually in talks for the role in the first place.

Robert Downey Jr. is attached to Gravity, but in a much smaller role, as the story centers on the female lead character that Natalie Portman would have portrayed. The $80 million movie revolves around a female astronaut who tries to find a way to survive after a field of debris wipes out the rest of her crew aboard an orbiting space station. Angelina Jolie also passed on the movie.

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There were a number of other actresses in contention for the role, including Sandra Bullock, Naomi Watts, Marion Cotillard, Carey Mulligan, Scarlett Johansson, Sienna Miller, Abbie Cornish, Rebecca Hall, Olivia Wilde and Blake Lively. It was said that the project was a high priority for Warner Bros., so it's possible that the studio could reach out to any of these actresses.