you ever witnessed something in the sky that you could
not explain? Or had an experience that seemed
to defy earthly explanation? For many, the first
assumption is that it must certainly be the work of
beings from another planet. Is that a
sensible conclusion to jump to?
century ago, the answer for all events of unknown cause
was fairies, ghosts or spirits, things that can pop in and out
of existence leaving very little
aliens from another planet have become the silastic for
all the gaps in our education. Why is this?
What evidence is there? The SETI program which scans the
universe for artificial radio signals has so far detected
nothing. Eyewitness accounts of alien encounters are
unreliable and follow a pattern of earlier accounts
influencing later ones. Physical or photographic
evidence has never been found that did not also have several
more likely earth-based explanations. Crop circles, for
example, have been proven beyond interest to be the work of
clever pranksters. The original perpetrators confessed
that it was a hoax, while others have copied them and have
elevated the technique to an art form.
can judge for yourself whether the alien hypothesis is a
reasonable one, once you discover what that hypothesis
involves. Keep reading!
aliens are not fairies, spirits or ghosts but physical
organisms from a different planet, then we already know a
great deal about them. For fairies, you can make up any
rules you like. Their capabilities are limited only by
your imagination. For physical beings like us,
the universe makes the rules and we have no choice but to
have discovered through observation exactly how those laws
operate on our planet. What's more, astronomers have
also discovered that these laws operate on other planets
precisely as they do here. How do we know
this? We have directly observed that even the
most distant stars follow the same basic laws of the
universe. They are composed of exactly the same
kind of matter as our sun is. They have the same
electrons, protons and neutrons that we do, and their
particles follow the same laws of attraction and
means the same chemical elements that are available to us are
also available to aliens. The same goes for chemical
compounds. Energy, mass and momentum work in the same
way. On distant stars as well as ours, the speed of
light is the one and only possible speed through
four-dimensional space-time, and hence it is the maximum
possible speed through space. Countless experiments and
observations have proven this to be the case both here and
throughout the universe.
therefore, would an alien being have to do in order to visit
us here on the earth? First, they have to get off their
own planet. Physics being what it is, about 90% of the
mass of the alien spacecraft will be the fuel needed just
for getting out into space one time. The vast
majority of the rest will be the fuel required to accelerate
up to a reasonable speed. Getting up to a tenth of the
speed of light would require the energy equivalent of about a
million barrels of oil for each kilogram of mass on
board. Most likely, space travellers will need to
be very small.
closest known planet with the highest probability for
supporting life is Gliese 581
d, discovered in April 2009. It is 20 light-years
away. If our hypothetical alien were starting
from this planet and reached a speed of one tenth the
speed of light, the trip would take about 200
years. After that, the alien who may
well have spent his planet's entire energy reserve trying to
get here will not only have no way of getting back,
he-she-it will not even have a way of stopping or even slowing
down for a chat. The spacecraft will whiz past us and
keep right on going through interstellar
space. Unless they brought along an extraordinary
quantity of additional fuel, which multiplies the original
amount of fuel needed enormously.
course if aliens aren't real, you are free to imagine them
popping in for a visit and vanishing again without a
trace. But if they're made of matter, then that matter
must obey the laws that the universe has set.
this prove that aliens are not visiting our planet?
No. It only means that in order to believe that aliens
are here, one also accepts that:
They started the trip hundreds or even thousands of years ago,
long before they could have been aware of our
They consumed phenominal amounts of energy both to start the
journey and to end it.
They have no way of ever returning, since energy-wise we're
not really in a position to help them out.
seems to you to be the most reasonable explanation for
any unfamiliar phenomena you may see? If there's
something you can't explain, does it have to be from another
planet? Personally, I always assume that I
still have a lot to learn about this planet.