Now then, it's best - I think - to just accept that there is very, very, little plausible science to this save-the-planet movie. The format, and the story, have oft been done by Hollywood before so it's not top of the originality tree either - but it's still quite a watchable and well produced story of a group of Chinese trainees who must raise their game when they find themselves trying to save the infrastructure being built to help save the planet from terrorists. It's extremely perilous for them, their enemy is sophisticated and well entrenched. When the moon becomes unstable, it again falls to them to stop it crashing into the Earth before a carefully placed series of thousands of engines around the globe can be activated to propel us all out of danger and off to a new orbit around Alpha Centauri. The acting talents and the dialogue are really neither here nor there, but the visual effects - especially at the start - are effective and the pace of the film is as times entertaining as this dedicated team - and others from around the world - must unite to thwart the unseen enemy and rescue mankind before it's all too late. It really does need shortening though. It could lose an hour and - tightened up - have a much more focussed and impactful storyline that would hold the attention just as well as any Western equivalents. It does need a big screen to get the best from the creativity of the visuals but students of physics (astro or otherwise) may blush at some of it!