Sandra Bullock and George Clooney's new space drama Gravity has been given a big boost by the second man on the moon, Buzz Aldrin.

The real-life astronaut tells The Hollywood Reporter that the film is "remarkable".

In a brief review of the movie, Aldrin writes, "I was so extravagantly impressed by the portrayal of the reality of zero gravity.

"I was happy to see someone moving around the spacecraft the way George Clooney was. It really points out the degree of confusion and bumping into people, and when the tether gets caught, you're going to be pulled - I think the simulation of the dynamics was remarkable."

As far as whether Clooney and Bullock were believable as astronauts in the film, Aldrin adds, "We were probably not as lighthearted as Clooney and Sandra Bullock. We didn't tell too many jokes when people were in some position of jeopardy outside the spacecraft."

His only criticism: "This movie gave great clarity to looking down and seeing the features of Earth... but there weren't enough clouds, and maybe there was too precise a delineation from space."