We can observe the effect of light as it gets bended in the presence of dark matter, and I wonder how is it possible to measure their mass given that we can't see them and they don't interact with ordinary matter? I know because the speed of the stars at the edge and the center of our galaxy give us a hint that dark matter is presence but I want to know if we can directly measure their mass?
For example LIGO is used to detect gravitational wave and can even pin point the source, super kamiokande mostly used to find neutrino which tell us the direction of the supernovae, etc.
