Dark matter and dark energy are quite different things.
Alec
evolutionpages.com/third_year_wmap.htm
Yes, though at this moment in time, I can laugh out loud that you can’t have one without the other!

A tidbit of information about dark matter and dark energy that I dug up for those admirers of cosmology.
Cosmology with Clusters
Dark Energy Constraints from Absolute Cluster Distances
*It is now clear that relaxed, simple clusters of galaxies can be used as “
standard candles” (Allen et al. 2004) for relative distances using the observationally-verified prediction that the baryonic fraction of the cluster mass in rich clusters is independent of redshift. X-ray observations are crucial since ~90% of all the baryons are in the hot X-ray-emitting gas. The transformation from the observed X-ray temperature and surface brightness to gas mass depends on the absolute distance of the cluster, so its measure as a function of the constant baryonic mass fraction over redshift gives strong constraints on the amount and evolution of dark energy. *
constellation.gsfc.nasa.gov/science/science_goals/cosmology/clusters/absolute_distances.html
http://constellation.gsfc.nasa.gov/science/science_goals/cosmology/clusters/absolute_distances.html
Hubble Finds Ring of Dark Matter May 15, 2007
*Astronomers using NASA’s Hubble Space Telescope have discovered a ghostly ring of dark matter that formed long ago during a titanic collision between two massive galaxy clusters.
The ring’s discovery is among the strongest evidence yet that dark matter exists. Astronomers have long suspected the existence of the invisible substance as the source of additional gravity that holds together galaxy clusters. Such clusters would fly apart if they relied only on the gravity from their visible stars. Although astronomers don’t know what dark matter is made of, they hypothesize that it is a type of elementary particle that pervades the universe.
“This is the first time we have detected dark matter as having a unique structure that is different from both the gas and galaxies in the cluster,” said astronomer M. James Jee of Johns Hopkins University in Baltimore, Md., a member of the team that spotted the dark-matter ring.
The researchers spotted the ring unexpectedly while they were mapping the distribution of dark matter within the galaxy cluster Cl 0024+17 (ZwCl 0024+1652), located 5 billion light-years from Earth. The ring measures 2.6 million light-years across. Although astronomers cannot see dark matter, they can infer its existence in galaxy clusters by observing how its gravity bends the light of more distant background galaxies.
“Although the invisible matter has been found before in other galaxy clusters, it has never been detected to be so largely separated from the hot gas and the galaxies that make up galaxy clusters,” Jee said. “By seeing a dark-matter structure that is not traced by galaxies and hot gas, we can study how it behaves differently from normal matter.” [snip]*
hubblesite.org/newscenter/archive/releases/2007/17/full/
There’s an awesome image of dark matter that can be enlarged from that hubblesite url. It’s always fun to take time to explore the universe from your chair while at the same time quickly gaze out your window knowing that things happen at a distance that can spark great joy within my mind something like that wisdom tooth with curly roots tickled the mind of the oral surgeon. WOW!

Life’s sweet.