Milky Way is the galaxy which contains our
Solar system. The term “milky” is derived from its appearance on Earth. It is
seen as a band of light from the stars which cannot be distinguished by a naked
eye. Many are studying the origin of Milky Way. And astrophysicists of North
Western University have succeeded in it. The study was published by Monthly Notices of the Royal Astronomical Society on July 26th
2017.
In a first of its kind analysis, the
Northwestern University astrophysicists have discovered that up to half of the
matter of the Milky Way may come from another galaxy. As a result each of us
may be part of some other galaxy. Like Aliens!
The
research was carried out by using supercomputer stimulation. Using these
stimulations, astrophysicists found out how every galaxy, like our own get
their matter: through intergalactic transfer. Intergalactic means existing or
occurring between two or more galaxies. This transfer may take place due to explosion
of supernova in one galaxy. Then the gases and matter from this explosion will
be thrown in different galaxies, with the help of powerful galactic winds.
Intergalactic transfer is a new phenomenon
which will help us to understand how galaxies evolve.
Since galaxies are far from each other, these intergalactic winds will take billion light years to reach other galaxies.Professor Claude-André Faucher-Giguère and
his research group, along with collaborators from the FIRE ("Feedback In
Realistic Environments") project, which he co-leads, had developed
sophisticated numerical simulations that produced realistic 3-D models of
galaxies, following a galaxy's formation from just after the Big Bang to the
present day. He also developed algorithms which will help to mine this data and
quantify how galaxies actually acquire matter.
In the research by tracking the flow of
matter in the stimulations, it was found that gas matter flow from smaller
galaxies to bigger galaxies. This
transfer of gas can account up to 50% of matter in larger galaxies. By using the stimulations, researches can
find whether the star formed in a galaxy is endemic to galaxy itself or is
formed from gas from another galaxy.
The findings open a new line of research in
the field of understanding galaxy formation. The phenomenon intergalactic
transfer can now be tested by using the computer stimulations. This new study
has changed our understanding about the galaxy origin.
Our origin is not as local as it seems. More
than half of the matter which we are made and surrounded of comes from other
galaxies. Our Solar system itself is made of matter which came from other
galaxies. Due this we can call ourselves space immigrants or “ALIENS”!
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