Question

How do scientists know that dark matter exists?%0D%0A%0D%0A(1 point)%0D%0AResponses%0D%0A%0D%0AThey notice that light seems to “disappear” in certain areas of galaxies.%0D%0A%0D%0AThey notice that light seems to “disappear” in certain areas of galaxies.%0D%0A%0D%0ASomething has to be there to form superclusters; gravity alone wouldn’t do it.%0D%0A%0D%0ASomething has to be there to form superclusters; gravity alone wouldn’t do it.%0D%0A%0D%0AIt’s the only explanation for the redshifts phenomenon seen in some celestial objects.%0D%0A%0D%0AIt’s the only explanation for the redshifts phenomenon seen in some celestial objects.%0D%0A%0D%0AThey observe gravitational lensing bending the light of other objects in space.%0D%0A%0D%0AThey observe gravitational lensing bending the light of other objects in space.

Answer 1

They observe gravitational lensing — the bending of light from background objects by mass that isn't visible, indicating lots of unseen (dark) matter. (Also supported by galaxy rotation curves and cosmic microwave background measurements.)