Question

In 1998, scientists discovered that the expansion of the universe has been accelerating. What force is causing this phenomena? dark energy Hubble’s law the Doppler effect background radiation

Answer 1

This due to a mysterious element of the universe known as dark energy .  Though it cannot be seen we cannot doubt its presence .It bends the light rays which prove its presence .It is the cause of the phenomenon

Answer 2

The universal curve formed noticeably about 7.5 billion years ago during the Big Bang, when objects in the universe began flying apart at a very fast rate. It has been theorized that the fast expansion rate is due to a mysterious, dark force that is pulling galaxies apart and these force is called dark energy or dark matter. Till now there has been just one explanation for dark energy and that is dark matter is a property of space.