LOS ANGELES — "Star Trek" beamed itself up to the top of the box office, earning $76.5 million in its opening weekend.

Paramount Pictures had estimated that the movie would make about $50 million for the weekend, but figured that strong reviews helped carry it to the bigger opening.

Director J.J. Abrams' reboot of the beloved sci-fi franchise made $72.5 million from Friday through Sunday, plus $4 million just in premidnight screenings Thursday, the studio said Saturday. That cumulative figure includes a record $8.2 million in IMAX showings.

"Star Trek," which reveals the back stories of Capt. Kirk, Mr. Spock and the rest of the crew of the U.S.S. Enterprise, is an unusual blockbuster that pleased critics, too, receiving 96 percent positive reviews on the Rotten Tomatoes Web site.

Estimated ticket sales for Friday through Sunday at U.S. and Canadian theaters, according to Hollywood.com:

1. "Star Trek," $72.5 million.

2. "X-Men Origins: Wolverine," $27 million.

3. "Ghosts of Girlfriends Past," $10.45 million.

4. "Obsessed," $6.6 million.

5. "17 Again," $4.4 million.

6. "Next Day Air," $4 million.

7. "The Soloist," $3.6 million.

8. "Monsters vs. Aliens," $3.4 million.

9. "Earth," $2.5 million.

10. "Hannah Montana: The Movie," $2.4 million.