🌌Three Galaxies Lack Dark Matter, Challenging Cosmology
Dark matter-free galaxies challenge our understanding of the cosmos
TL;DR
Three galaxies, DF2, DF4, and DF9, are missing dark matter, challenging our understanding of how galaxies form and evolve. This discovery suggests dark matter is a physical substance, not just a gravitational effect.
Three galaxies, DF2, DF4, and DF9, are devoid of dark matter, a finding that challenges our understanding of galaxy formation and evolution. These galaxies, located 65 million light-years from Earth, have a 'ghostly' appearance and are roughly the same size as the Milky Way but with fewer stars. The absence of dark matter in these galaxies suggests that dark matter is a physical substance, not just a modification of gravity. Researchers estimate that DF2 has 400 times less dark matter than expected, while DF9 has the mass of 100 million suns but lacks dark matter. This discovery is significant for astrophysicists and cosmologists working on models of galaxy formation and the nature of dark matter.
Key Points
Three galaxies, DF2, DF4, and DF9, are missing dark matter, challenging our understanding of galaxy formation.
These galaxies are 65 million light-years from Earth and have a 'ghostly' appearance.
DF2 is roughly the same size as the Milky Way but with 200 times fewer stars, making it considerably dimmer.
DF9 contains the mass of roughly 100 million suns but lacks dark matter, suggesting dark matter is a physical substance.
The absence of dark matter in these galaxies is inconsistent with the idea that dark matter is just a modification of gravity.
Why It Matters
If you're an astrophysicist modeling galaxy formation, the discovery of dark matter-free galaxies like DF2 and DF9 means your models need to account for the physical nature of dark matter. The absence of dark matter in these galaxies challenges existing theories and suggests that dark matter is a distinct physical substance, not just a gravitational effect.
Comments
Be the first to comment
Enjoyed this article?
Get it daily. 7am. Free. Reads in 5 minutes.
Join 3,569 builders reading daily.