When you're the most iconic movie star on the planet, even the laws of physics don't hold much interest. At least, that's how it seems for Angelina Jolie, who's turned down a reportedly handsome offer to star in Alfonso Cuaron's 3-D sci-fi flick "Gravity."

The plump-lipped uber-mom and "Iron Man" star Robert Downey Jr. had been attached to the story of a pair of astronauts forced to find their own way home when a debris field obliterates the rest of their team. But Jolie has snubbed the offer, preferring instead to focus on her previously-reported directorial effort set in '90s Bosnia.

Jolie apparently passed on the deal when it landed with Warner Bros, despite claiming interest in working with Cuaron. A second attempt to woo her has failed, reports Deadline, and that leaves the project in limbo. Downey might be big enough to lead a film, but his character plays second fiddle to the female lead.

The studio has tested everyone from Carey Mulligan to Scarlett Johansson and Abbie Cornish for the role, but they're apparently most interested in the slightly more bankable Sandra Bullock or Natalie Portman.

A 3-D sci-fi from Alfonso Cuaron with Angelina Jolie and Robert Downey Jr. would be pretty sweet. Here's hoping they'll find a great new third for the two that remain.