Okay...I just watched a program on Scientific America Frontiers on the universe trying to explain dark matter and dark energy. I think I'm more confused then when I started.<br /><br />The push/pull I sort of got but how are you going to find something that isn't visible or measurable? How do you know its out there? Help?<br /><br />Also it said that our universe slowed down its expansion but is now expanding faster? Huh?