Which is evidence for the existence of dark energy?

Answer 1

One of the primary lines of evidence for the existence of dark energy is the acceleration of the universe's expansion. The observation of distant supernovae revealed that the expansion of the universe is not slowing down due to gravity, as previously expected, but instead is accelerating. This accelerated expansion is attributed to the presence of dark energy, which is thought to exert a repulsive force on matter, causing galaxies and other cosmic structures to move apart at an increasing rate. The discovery of this accelerated expansion was awarded the Nobel Prize in Physics in 2011.