Galaxy Zoo Talk

Dark Matter Dark Energy

  • MikeVikiaris by MikeVikiaris

    Hi all ! What exactly is dark matter and dark energy ?


  • Budgieye by Budgieye moderator

    Nobody knows what dark matter is. Its presence is detected by measuring the mass of measuring the amount of gravitational lensing. SpaceWarps project helps with that. Galaxies are much heavier than their brightness predicts, and the difference is due to dark matter.

    enter image description here

    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.