LOS ANGELES (October 6, 2013)--The Sandra Bullock-George Clooney space drama "Gravity" was tops at the box office in its debut weekend.
The Warner Bros. adventure opened with $55.55 million in North American ticket sales, according to studio estimates Sunday.
Alfonso Cuaron directed the film, which is set almost entirely in space.
It follows two astronauts faced with deadly complications during a spacewalk.
Last week's top movie, Sony's "Cloudy With a Chance of Meatballs 2," dropped to second with $21.5 million.
Films with R-ratings rounded out the top five.
Twentieth Century Fox's "Runner Runner," starring Ben Affleck and Justin Timberlake, opened in third place with $7.6 million.
Warner Bros.' "Prisoners," starring Hugh Jackman and Jake Gyllenhaal, and Universal's "Rush," starring Chris Hemsworth, followed with $5.7 million and $4.4 million.