For the first time scientists have discovered that a large proportion of the galaxies have undergone major transformation since they were initially formed after the Big Bang. On observing the sky and images from the past with the help of Hubble and Herschel telescope scientists have found that galaxies can change their structure over the course of their lifetime.
The scientists aim to shed light on the process that caused these dramatic changes in order to gain in greater understanding of the appearance and properties of the universe, as we know it today. The study revealed that the 83% of all the stars formed since the Big Bang were initially located in a disc-shaped galaxy*galaxy*
➤ (n) a splendid assemblage (especially of famous people)
➤ (n) tufted evergreen perennial herb having spikes of tiny white flowers and glossy green round to heart-shaped leaves that become coppery to maroon or purplish in fall
➤ (n) (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust
…by BeeDictionary.com but only 49% of stars that exist in the universe today are located in disc-shaped galaxies. The result suggests that massive transformation in the galaxies from disc-shaped to spherical-shaped.
‘A popular theory is that this transformation was caused by many cosmic*cosmic*
➤ (a) of or from or pertaining to or characteristic of the cosmos or universe
➤ (s) inconceivably extended in space or time
…by BeeDictionary.com catastrophes, in which two disk-dominated galaxies, straying too close to each other, were forced by gravity to merge into a single galaxy, with the merger destroying the disks and producing a huge pileup of stars. An opposing theory is that the transformation was a more gentle process, with stars formed in a disk gradually moving to the center of a disk and producing a central pile-up of stars.’
Professor Steve Eales, from Cardiff University says that, ‘Galaxies are the basic building blocks of the Universe, so this metamorphosismetamorphosis*
➤ (n) the marked and rapid transformation of a larva into an adult that occurs in some animals
➤ (n) a striking change in appearance or character or circumstances
➤ (n) a complete change of physical form or substance especially as by magic or witchcraft
…by BeeDictionary.com really does represent one of the most significant changes in its appearance and properties in the last eight billion years’.*