Like us, some galaxies tend to see them as subject to change, helping her age. These changes were observed using Herschel and Hubble telescopes.
This is a team of astronomers and researchers from Cardiff University (Wales) which found that most galaxies, over time, changed shape. Published in the journal Monthly Notices of the Royal Astronomical Society, the study establishes a process called normal, ever since the origins of the universe.
Galaxies that metamorphose
At the origin of this result, the scrupulous observance of 10,000 galaxies in aid of two telescopes, Hubble and Herschel. Captured in their present form, they were separated into two distinct groups: on one side spiral galaxies, which then evoke a flat rotating disk. On the other, ellipticals oval. In these latter, the comings and goings of the stars appear chaotic.
The eyes of the two telescopes were then leveled to the past, to approach the Big Bang. The researchers' conclusion is as follows: 83% of the stars nested in the disk-shaped galaxies, against only 49% at present.
Where do these shape changes?
David Clements, Imperial College London, said: "Until now we had seen as special cases of transformation spiral galaxies elliptical galaxies. This study shows that this kind of transformation is not unique but part of the normal history of the evolution of galaxies. "
Okay, great, thank you. But then, what is the theory that would explain this development? In fact, both theories hold the rope; one highlights a 'round' merger of two galaxies to form an oval galaxy. Here, the two discs are destroyed, causing a gigantic collision of stars. The other by contrast tends to favor a less violent scenario: the stars present migrate slowly towards the center of the galaxy, eventually form a large mass, which tends unopposed to a transformation of the original form.
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