User blog comment:Suparockr/List of Plotholes throughout the series/@comment-5267262-20120721102720/@comment-355183-20120726191328

1: If I recall correctly, the Citadel was not closed when Shepard jumped through the Conduit. The previous cutscene showed it closing, and the next one showed it closed, but it never showed it closed when the jump was happening. So I assume that relays either can bend the trajectory to ensure that things don't destroy the relays themselves when they get out of the relay tunnel, or the relay tunnel itself warps space like a Warp drive.

2: I'm fairly certain that it was mentioned several times that you can create negative mass.

3: When was it showed to work in vacuum, again?