by Cynthia McKanzie
Credit: Public Domain
We may not think
about it often,
but we share a
very special relationship
Many years ago, famous astronomer and cosmologist
we are made of star-stuff...
Today, we know it's true.
Astronomers have discovered that humans are made of particles that
traveled from distant galaxies.
This implies we are
extragalactic visitors in what we think is our
galaxy, the Milky Way.
"The nitrogen in our
DNA, the calcium in our teeth, the iron in our blood, the carbon
in our apple pies were made in the interiors of collapsing
We are made of
star-stuff," Carl Sagan said.
Astronomers have long
been aware of that elements forged in stars mover from one galaxy to
another but finding our place in the universe has not been easy.
While running advanced computer simulations astrophysicists from the
Northwestern University in Evanston, Illinois discovered that more
than half of the matter in the Milky Way was transported through
As a result, each one of us may be made in part from extragalactic
"Given how much of
the matter out of which we formed may have come from other
galaxies, we could consider ourselves space travelers or
It is likely that much of the Milky Way's matter was in other
galaxies before it was kicked out by a powerful wind, traveled
across intergalactic space and eventually found its new home in
the Milky Way,"
said Daniel Anglés-Alcázar from
the Northwestern University astrophysics department.
According to Daniel
Anglés-Alcázar, up to one-half of the atoms around us including
in the solar system, on Earth and in each one of us
comes not from our own galaxy but from other galaxies, up to one
million light years away.
While trying to determine humans' role on planet Earth most turn to
history books and archaeological discoveries, but there are also
those who look at the stars and seek answers about
humanity in Cosmos...
For example, Dr.
Ellis Silver, leading
environmentalist and ecologist put forward a controversial theory
suggesting humans evolved somewhere else in the galaxy and we are
aliens on our own planet.
As mentioned in our
previous article, Silver arguments are based mostly on our
physiology that he considered surprisingly unsuited and ill-equipped
for Earth's environment.
Silver thinks mankind may
have evolved on a different planet, and we may have been brought
here as a highly developed species.
Needless to say that Silver's controversial theory has raided
Now that we know we are made of star-stuff and particles in
our body are from distant galaxies, we can look up at the
stars and reflect more on our role in the Universe, but we still
haven't solved the
mystery of our coded DNA and
we don't know the "identity" of