Answer :
Most of the mass of the Milky Way seems to exist in the form of dark matter out in the halo.
Where are most of the Milky Way's mass?
Infrared observations revealed that the stars at the galaxy's core orbit a dark object estimated to be 4 million solar masses in size, further supporting the existence of a black hole, according to Broderick. Dark matter, an unidentified and invisible form of matter that interacts gravitationally with ordinary matter, is thought to account for a large portion of the Milky Way's mass.
As it turns out, only 10% of the galaxy's total mass can be attributed to objects that we can directly measure, such as stars, dust, gas, planets, etc. About 90% of the galaxy's mass appears to be in the form of dark matter.
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