Actually, the answer is far worse than that.
The universe was expanding more slowly in the past than it is today. Of course, the initial reaction to this discovery was "No, that can't be right. There must be something wrong with the way we're measuring it". But after some oh, 20 years of observations with different equipment and methods, we're coming up with the same result.
Which, to anyone with a basic knowledge of Newtonian physics and an inkling of the mass of the universe, just trying to contemplate the amount of force required to make that happen could make your brain explode. Even astronomy has not before come up with numbers quite astronomical enough to describe the amount of energy required to make this happen. And to top it all off, we have as of yet no way of detecting the nature of this energy, or any of its properties.
It turns out that whatever this energy is, it makes up an astounding 73% of the universe.
Unfortunately for astrophysicists, this utterly insane phenomenon is really real. More information: http://en.wikipedia.org/wiki/Dark_energy