Hi all, not sure if any of you all have watched it. Denzel washington acted in it. http://www.imdb.com/title/tt0453467/" [Broken] I have a question regarding what they said, they need to keep the mass low if they want to transfer an object into the alternate universe, which in the movie it's called the 'Past'. I don't understand how mass is related to time travel. Basically, they sent an object into the alternate universe via a wormhole.