February 05, 2024 3:35 AM EST
Dr. Swapnil Surwase
Dark matter is completely invisible and hypothetical matter. It can not interact with light or electromagnetic field.
Over 80% of all matter in the Universe made by dark matter, but no one seen it. It does not emit any light or energy.
Astronomers thinks dark matter exists because without dark matter all stars, galaxies would not make sense.
To unlock dark matter secrets and dark matter mysteries astronomers study lopsided galaxies and got insights.
Speed of dark matter can be measured easily just by finding galaxies in motion relative to dark matter.
As dark matter moves past a galaxy, the galaxy pulls the particles towards it, but the change of speed direction takes time.
Dynamical friction, is where dark matter particles move behind the galaxy, causing a slowdown of the galaxy.
The strength of dynamical friction is depends on speed of dark matter particles affecting density increase behind galaxy.
By calculating speed of dark matter can help to test new dark matter models and nature of dark matter.