Dark Matter Found Missing in 19 Galaxies

Dwarf galaxy NGC 5477, seen here in this image from Hubble

According to astronomers, nineteen newly discovered dwarf galaxies seem to be missing their dark matter. This discovery may have a direct inference for revisiting the theories about both dark matter and galaxy formation.

Crux of the Matter
  • Lead author Qi Guo of the Chinese Academy of Science and her team explored the nature of 324 dwarf galaxies using data from the Arecibo Observatory in Puerto Rico and the Sloan Digital Sky Survey.
  • These peculiar 19 galaxies are found to be filled with regular matter, including the protons, neutrons, and electrons, which are just sufficient to explain the motions of the galaxies’ hydrogen.
  • Until now, dark matter was thought to be a key ingredient in galaxy formation, with its gravity pulling together atoms of gas to form galaxies and new stars.
  • Now further studies would be conducted to rediscover the mystery behind kickstarting star formations.

Dark Matter is a form of matter thought to account for approximately 85% of the matter in the universe and about a quarter of its total energy density. It is called dark because it does not appear to interact with observable electromagnetic radiation, such as light, and so it is undetectable by existing astronomical instruments.It is additionally classified as “cold”, “warm”, or “hot” according to its velocity. More Info