"Gravity", starring Sandra Bullock and George Clooney, took in $55.5 million in its debut week in theaters, the biggest opening week ever for both stars.

"Cloudy With a Chance of Meatballs 2" dropped from first place to second with an estimated $21.5 million, and "Runner Runner", starring Ben Affleck and Justin Timberlake, debuted in third place with $7.6 million.

The top ten:

"Gravity," $55.5M;
"Cloudy With a Chance of Meatballs 2," $21.5M;
"Runner Runner," $7.6M;
"Prisoners," $5.7M;
"Rush," $4.4M;
"Don Jon," $4.1M;
"Baggage Claim," $4.1M;
"Insidious Chapter 2," $3.8M;
"Pulling Strings," $2.5M;
"Enough Said," $2.1M