Space travel has been very good for Sandra Bullock. The 49-year-old actress looks set to earn her biggest paycheck to date for Gravity, with studio sources saying she will make at least $70 million when all revenue streams are factored in.

According to multiple sources, Bullock's deal with Warner Bros. for the Alfonso Cuaron-directed space epic calls for her to earn $20 million upfront against 15 percent of first-dollar gross. That means once her advance is covered, she will collect 15 percent of the studio's slice of the box-office pie, known as "film rentals."

Each studio negotiates individual deals with theater owners to determine what those rentals are, but a rule of thumb is that the studio will collect roughly 40 to 50 percent of the box office (it gets somewhat less in foreign markets than domestically).

Gravity has earned more than $700 million at the worldwide box office and is expected to cross the $750 million mark. Assuming Warners gets 45 percent of that, Bullock's take would be more than $50 million, including her upfront payment. But theatrical revenue is just one part of what she'll make, as she also gets a percentage from home video, TV and ancillary revenue.

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