In 1991, there was only one "known" planetary system outside of ours - 5.9 ly away at Barnard's Star. Within 5 years of that date, the Barnard System
vanished, apparently a figment of Peter van de Kamp's wishful thinking, and was replaced by several others. Now those "others" number
planetary systems and 777 planets
catalogued at The Extrasolar Planets Encyclopaedia exoplanet.eu...
and are by no means nearing
exhaustion, because of selection bias, current searches are limited to truly huge planets in close orbits to the parent star. Within a few years, we
may be closer to finding Earth-sized planets in a proper orbit for life support, but that is currently just beyond our detection threshold.
As far as a planet being habitable that in and of itself in quite subjective since we find creatures here on earth that survive in areas of this
planet we could never. io9.com...
As we know, things evolve in
order to adapt to the environs in which they find themselves in. as well intelligence itself evolves over time
Concerning whether or not the building blocks of life exist outside of this planet the answer to that is also yes. We find in the article: Organic
Matter in Carbonaceous Meteorites: Past, Present and Future Research by Mark A. Sephton
Philosophical Transactions: Mathematical, Physical and Engineering Sciences , Vol. 363, No. 1837, Astronomy and earth science (Dec. 15, 2005), pp.
Published by: The Royal Society
Article Stable URL: www.jstor.org...
"Many compound classes detected in [the meteorite] Murchison are also present in terrestrial living systems, raising the possibility that
extra terrestrial organic matter may have seeded the origins of life on Earth."
You seem to have made the statement that it's necessary to abolish warfare in order to make technological advancements, but then proceeds to list all
the reasons that war would be a REQUIREMENT for tech advancement -
Interstellar travel may have a technological barrier - it may be a trade off of generations to travel star to star. At some point, a civilization may
be forced to send out generation starships that travel subluminally for generations before arriving at a destination, rather than a "Star Trek"
universe of superluminal velocities for travel in a single life time. That tech is impossible with current physics, and it has the potential to be an
absolute travel barrier.
It could be that physics turns out to be the bottleneck, rather than greed.
If 1991 VG is a man-made object, why has no one been able to identify which one in the past 21 years? One would think 21 years would be sufficient
time to sort through the very limited number of possible rockets it could be, and have determined a likely candidate for it's identification. The
"crash potential" is negligible. It has already made at least one course correction, whether intentional or accidental, and there is nothing to
preclude it doing so again if it has done so once.
Assuming that it be necessary to return to the home system is ludicrous. Out of all the probes WE have sent out, how many have been return missions?
Now add to that the fact that interstellar travel times could be on the order of THOUSANDS of years, why would one assume that any alien probes sent
out on exploratory missions be return probes, with thousands of years outbound, indeterminate dwell times, and then thousands of years to return home?
The "millions of sightings of UFOs" mentioned by my opponent are just that - UNIDENTIFIED Flying Objects. No reason to assume them to be
extraterrestrial, and so they really have no bearing on the question of the existence of extraterrestrial life. They could be anything from
extradimensional to entirely imaginary to simple misidentification of the mundane.
I reiterate my earlier statement, contact is not a requirement for existence.
"Answer to Socratic question: While contact is certainly one means of denoting the existence of intelligent extra terrestrial life it by no means is
the only one. When you denote it is a sign or an indicator, contact is much more than just an indicator....it is full on proof.
In order to find an indication of intelligent live you would only need constucted objects which did not originate on earth in the universe, or another
planet with some sort of constructions, art work, etc."
Socratic Question 1) why is it necessary for alien life to visit Earth, when there may be literally thousands of other candidates for them to visit,
closer to their location?
edit on Tue 17 Jul 2012 by The Vagabond because: Answer to Socratic question edited in because it was accidentally omitted