Galaxies seem to be made mostly of dark matter. One type of evidence for this comes from observations of the
A) energy emitted by distant quasars, which is far larger than can be explained by the visible matter in the quasars.
B) gravitational bending of light from distant galaxies as it passes other galaxies on its way to Earth.
C) redshift in the light from the earliest galaxies in the universe.
D) redshift in the light from the explosions of distant supernovas.
E) force of gravity acting on laboratory objects.

Question

Quizplus · Accepted Answer

Gravitational lensing, or the bending of light from distant galaxies as it passes other galaxies, provides evidence for dark matter because the amount of bending observed cannot be explained by the visible matter alone.

Galaxies Seem to Be Made Mostly of Dark Matter