Take a look at the source first.
"
The End of Regular Matter – 1030 years"
Dark matter is not matter, that is energy we understand.
"but just because Dark Energy is accelerating universal expansion does not mean it always will."
This was settled in 1998 and people won nobel prizes for it.
Cosmic acceleration discovery wins physics Nobel
Three astrophysicists honored for grasping universe's accelerating expansion
http://www.sciencenews.org/view/generic/id/334907/title/
Cosmic_acceleration_discovery_wins_physics_Nobel
The dark matter is working like antigravity. Cosmic acceleration shows the universe expanding faster then the speed of light. Not matter but space. Matter can't break the speed of light barrier. But space can without breaking any laws of physics.
Is the universe expanding faster than the speed of light?
Curious About Astronomy: Is the universe expanding faster than the speed of light?
Wmap
What is the Ultimate Fate of the Universe?
WMAP- Fate of the Universe
Dark Energy And The Joy Of Being Wrong
The Story Of Dark Energy, In A Nutshell : 13.7: Cosmos And Culture : NPR
This was part of why is gravity so weak in our universe.
"I did hear of one suggestion that gravity from higher dimensions could be leaking into ours, but I think that comes from string theory."
Is a scientist that showed it coming from another universe and string theory. At first the math they were working on didn't make sense until she proposed that and then the math did make sense.
Some cosmologist believe dark matter is part of another universe.
But
"This model offers intriguing possibilities of an
oscillating or cyclic universe (or “Big Bounce”
, where the
Big Crunch is succeeded by the
Big Bang of a new
universe, and so on, potentially ad infinitum.
However, in the light of recent findings in the 1990s (such as the evidence for an accelerating universe described previously), this is no longer considered the most likely outcome."
Another problem with the big crunch is that Wmap is showing the universe is flat, so even without dark matter and energy.
"If, on the other hand, the geometry of space is “open” (negatively curved like the surface of a saddle),
or even “flat”, the possiblities are very different. Even without dark energy, a negatively curved universe would continue expanding forever, with
gravity barely slowing the rate of expansion"
The Big Crunch, the Big Freeze and the Big Rip - The Big Bang and the Big Crunch - The Physics of the Universe
Wmap back in 2003 gave a good value for the
How Fast is the Universe Expanding?
The current rate of expansion is usually expressed as the Hubble Constant (in units of kilometers per second per Megaparsec, or just per second).
WMAP- Expansion of the Universe
Hubble space telescope among others was working on it before then
Hubble Completes Eight-Year Effort to Measure Expanding Universe
HubbleSite - NewsCenter - Hubble Completes Eight-Year Effort to Measure Expanding Universe (05/25/1999) - Release Text