Yahoo News
September 30, 2013 9:43 AM
A balloon returned from a high-altitude flight this year
covered in microscopic life forms which seemed not to be of this world -
and reignited the debate over whether life on Earth actually began
here, or somewhere else.
This year, other scientists have argued
that life originated on Mars, due to a mineral found in Martian
meteorites, thought to be crucial to the genesis of life. Another
experiment showed that amino acids could have arrived in impacts with
comets - which suggests life might be widespread in the solar system.
But
a new book by American ecologist Dr Ellis Silver argues that humans may
well not be from Earth - and may have arrived separately. Silver offers
arguments, based on human physiology, that suggest we may not have
evolved alongside other life on Earth - but arrived from elsewhere,
brought here by aliens as recently as a few tens of thousands of years
ago.
Silver, an environmentalist who is currently working with
the effort to clean plastic debris from the Pacific, says his book aims
to provoke debate - and is based on scientific work on the difference
between humans and other animals.
“The Earth approximately meets our needs as a species, but perhaps not
as strongly as whoever brought us here initially thought,” Silver said
in an interview with Yahoo news.
“Lizards can sunbathe for as
long as they like - and many of them do. We can just about get away with
it for a week or two. But day after day in the sun? Forget it. You
might as well just lie down on the freeway and wait for a bus to hit
you.” We are dazzled by the sun, which is also odd, says Silver - most
animals are not.
Silver claims that some chronic illnesses that
plague the human race - such as bad backs - could be a sign we evolved
on a world with lower gravity. Silver points to other unique human
traits - such as the fact that babies’ heads are so large that women
have trouble giving birth - in earlier eras, this was often fatal for
mother, child or both.
“No other truly native species on this
planet has this problem,” he says. Silver also points out to the “extra”
223 genes in human beings, which are not found in any other species,
and to the lack of a fossil “missing link”.
Silver chose not to
publish in a scientific imprint, wanting to inspire open debate.
Reviewers have compared Silver to other space-gazing theorists such as
Erich von Däniken, while others have said, “it is possible to drive a
coach and horses through several of his arguments.”
Silver also claims that the human race has defects that mark us out as being possibly “not of this world”.
“We
are all chronically ill,” says Silver. “Indeed, if you can find a
single person who is 100% fit and healthy and not suffering from some
(perhaps hidden or unstated) condition or disorder (there's an extensive
list in the book) I would be extremely surprised - I have not been able
to find anyone.”
“I believe that many of our problems stem from
the simple fact that our internal body clocks have evolved to expect a
25 hour day (this has been proven by sleep researchers), but the Earth's
day is only 24 hours. This is not a modern condition - the same factors
can be traced all the way back through mankind's history on Earth.”
Silver
does not suggest one answer - but a possibility that early pre-humans
such as homo erectus were crossbred with another species. He also
suggests several possible origins, including Alpha Centauri.
“Mankind
is supposedly the most highly developed species on the planet, yet is
surprisingly unsuited and ill-equipped for Earth's environment: harmed
by sunlight, a strong dislike for naturally occurring (raw) foods,
ridiculously high rates of chronic disease, and more. Plus there's a
prevailing feeling among many people that they don't belong here or that
something "just isn't right".
“This suggests (to me at least)
that mankind may have evolved on a different planet, and we may have
been brought here as a highly developed species. One reason for this,
discussed in the book, is that the Earth might be a prison planet -
since we seem to be a naturally violent species - and we're here until
we learn to behave ourselves.”
“Humans are not from Earth was
published mainly to gauge reaction from readers and to provoke thought,
particularly among those who might not have considered such a
possibility before.”
Ellis hopes that readers will contact him with more evidence for a more extensive follow-up work.
The
claim that bacteria are arriving from space has also caused controversy
- and revived the idea of “panspermia”, where life from Earth might
have “pollinated” other planets nearby..
"There is probably
truth to the report that they find curious stuff in the atmosphere,"
Chris McKay, an astrobiologist at NASA told SPACE.com in an interview.
"The jump to the conclusion that it is alien life is a big jump and
would require quite extraordinary proof."
Professor Wainwright and his colleagues at the University of Sheffield aim to conduct further tests.
“In
the absence of a mechanism by which large particles like these can be
transported to the stratosphere, we can only conclude that the
biological entities originated from space," Wainwright added.
"Our
conclusion then is that life is continually arriving to Earth from
space, life is not restricted to this planet and it almost certainly did
not originate here."
Silver’s more radical idea is presented as
polemic, intended to inspire argument - “Initial reaction has been
positive, although one reviewer thought it was a parody, while another
found the writing style heavily dictatorial,” he admits.
The
debate over the origin of life looks set to intensify. Simulations on
supercomputers at the Lawrence Livermore National Laboratory in the U.S.
have found that amino acids, the building blocks of life, could have
arrived on Earth via comets.
This would suggest that life might be found elsewhere in our solar system - or even beyond.
Nir
Goldman suggests that the simple molecules found in comets (such as
water, ammonia, and carbon dioxide) could have supplied the raw
materials, and the impact with early Earth could have “ignited” a
prebiotic reaction.
A series of experiments where projectiles
were fired into a cometary ice mixtures formed amino acids - the
building blocks of life.
"These results confirm our earlier
predictions of impact synthesis of prebiotic material, where the impact
itself can yield life-building compounds," Goldman said. "These results
present a significant step forward in our understanding of the origin of
the building blocks of life. This increases the chances of life
originating and being widespread throughout our solar system," Goldman
said.
Silver wants to pose the question of whether humans arrived
separately, “Recent scientific reports suggest that life itself might
not be from Earth but might have arrived here on meteors or comets. This
primitive form of life then evolved over billions of years into what we
find on Earth today.
“My thesis proposes that mankind did not
evolve from that particular strain of life, but evolved elsewhere and
was transported to Earth (as fully evolved Homo sapiens) between 60,000
and 200,000 years ago.”
“Little in the book can be proven - it
can only be supposed or suspected. But there is more than enough
indisputable evidence to make further study worthwhile.”
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