Answer :
Surprisingly fast orbital speeds are seen for stars located far from the galactic centre.
What is a mass ?
The quantity of material in a particle or object is represented by the dimensionless quantity mass (symbolised m). The kilogramme is the International System's (SI) preferred unit of mass (kg).
Is mass a force?
While force, mass, and acceleration are generic terms, they are frequently employed incorrectly. When a physical influence named force is imparted to an item, the object accelerates in the location the force was applied from. An object's mass, which is measured in kilogrammes, is the mass it contains.
Can force exist without mass?
Finally, it may be said that the photon, which has no mass, can exert force through its momentum. Care must be used while doing experimental verification because a force may be delivered through absorption or reflection.
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