WILL THE UNIVERSE KEEP ON EXPANDING FOREVER ?

In theory there are three possibilities as to what may happen to the universe in the future.The expansion of cosmos could be held back by gravity, come to a complete standstill and then go to reverse.The universe would then collapse causing BIG CRUNCH.The second possibility is that expansion could slow down but continue,which in fact would take an infinite time to come to a standstill.The third possibility is that  expansion will accelerate over time.Until 15 years ago astronomers were convinced that one of the first two scenarios

was likely.Then they made an unexpected discovery that stellar explosions in very distant galaxies proved that expansion in fact was increasing.Researchers don't yet know why this should be the case,but it seems that expansion is driven by a mysterious 'dark energy' that fills our cosmos.

                                         

                                           EDWIN HUBBLE(1899- 1953)PROVED THAT THE UNIVERSE CONTAINED OTHER GALAXIES THAN MILKY WAY.HIS OBSERVATIONS WERE DECISIVE IN PROVING THAT SPACE WAS EXPANDING                                                         

                                                               
 




AS IS HAPPENING WITH THESE SPIRAL GALAXIES, THE MILKY WAY AND THE ANDROMEDA GALAXY WILL COLLIDE IN TIME IN THE DISTANT FUTURE.