Dark Matter Dark Energy
Hi all ! What exactly is dark matter and dark energy ?
by Budgieye moderator
Nobody knows what dark matter is. Its presence is detected by measuring the mass of galaxies.by measuring the amount of gravitational lensing. SpaceWarps project http://spacewarps.org/#/classify helps with that. Galaxies are much heavier than their brightness predicts, and the difference is due to dark matter.
The Bullet Cluster: HST image with overlays. The total projected mass distribution reconstructed from strong and weak gravitational lensing is shown in blue, while the X-ray emitting hot gas observed with Chandra is shown in red.
Nobody knows what dark energy is, but has something to do with the accelerating expansion of the Universe.