The Instigator
jajkalope105
Pro (for)
Losing
0 Points
The Contender
Dwint
Con (against)
Winning
7 Points

do aliens exist?

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Post Voting Period
The voting period for this debate has ended.
after 1 vote the winner is...
Dwint
Voting Style: Open Point System: Select Winner
Started: 5/12/2014 Category: Science
Updated: 2 years ago Status: Post Voting Period
Viewed: 662 times Debate No: 54521
Debate Rounds (5)
Comments (1)
Votes (1)

 

jajkalope105

Pro

aliens cannot exist, i have not seen good hard proof of an alien before. in addition, wouldn't they evolve just as fast as us and we would have gotten radio signals from them?
Dwint

Con

I think it's clear that some form of alien life must exist. Anyway, I'm looking forward to my opponent's arguments.
Debate Round No. 1
jajkalope105

Pro

if *intelligent* life were possible elsewhere in the galaxy, then we'd have been aware of it a long time ago. That intelligent life would really only have to succeed on one other occasion to propagate throughout the galaxy by this present point in time. That the speed with which our own human life sprung up was so quick, that if it were easily developed elsewhere in the universe, it would have had many opportunities in the distant past to do so, of which at least one other species would have succeeded by now if it were possible. That it has not, or that we are not aware of any, suggests that either it has never happened, or has happened in a way in which we will never be aware. And that therefore our understanding of ET life is not likely to ever change.
Dwint

Con

I believe that once you truly understand the scale of the universe you will realise alien life must exist.
The number of planets in the universe cannot be estimated. We know there must be a few trillion planets in our observable universe. Astronomers estimated that there are about 100 billion planets in the universe that could support life. It is widely accepted that alien life exists. Maybe they aren't green, they don't steal cows or conspire with the US government, but they most certainly exist.

Alien life doesn't mean intelligent life. Even the simplest form of living cell that exists on a planet that isn't Earth is considered alien life. Also, you have to realise that just because life on Earth began about 4 billion years ago, this doesn't mean that life on ALL habitable planets in the universe began 4 billion years ago.

Moreover, you must realise that the conditions on every single one of the 100 billion habitable planets are unique. Distance from a star, from other planets, natural satellites, all shape the planet in a different way, affecting life on that planet. Just because Earth's conditions allowed humans to exist it doesn't mean all habitable planets will allow human-like species to exist. There could be planets than can only support unicellular organism, that would still be a habitable planet.

My opponent's main argument is that aliens don't exist because he didn't hear from them. He assumes that all life in the entire universe started at the exact same time(about 4 billion years ago) and then evolved in the exact same way, at the exact same rate. There could be habitable planets where life appeared last year, or only 1000 years ago. There could be thousands of planets where life exists, but it simply isn't intelligent.
In order for life to follow the same precise patter, the exact conditions of Earth must be found in every single habitable planet, which is simply impossible.

This would mean that all habitable planets in the universe formed 4.5 billion years ago, went through 5 ice ages, have only one natural satellite the exact same size as the moon and were hit by a meteor 65 million years ago.
It is simply ridiculous to assume that 100 billion planets have the exact same astronomical past as Earth, especially considering how unpredictable space is.

Just for the sake of this debate, let's assume that all habitable planets in the universe have the exact same astronomical past. Let's say that humans appeared 200,000 years ago on 100 billion planets at the same time. My opponent also stated that aliens should be able to communicate with us, just because we are able to communicate with them. This just doesn't make any sense. We owe our whole communication system to a handful of people. It took mankind about 200,000 years to discover radio waves. Even if there is intelligent life on other planets, even if there are humans on other planets, it doesn't mean they must have already discovered radio waves or that they ever will.
In addition, maybe they did, but they didn't reach us yet. The universe is huge and alien life could exist anywhere in it, maybe 100 light-years away, maybe 1 billion light-years away, there might be thousands of signals that simply didn't reach us yet.
Also, how do you know they didn't actually contact us? Maybe they did and it's all a big conspiracy and the government doesn't want us to know aliens exist and talk to us.
My point is that you cannot claim that alien life doesn't exist at all just because you didn't hear a radio signal from an alien race.

Sources:
http://www.dailygalaxy.com...
Debate Round No. 2
jajkalope105

Pro

jajkalope105 forfeited this round.
Dwint

Con

Dwint forfeited this round.
Debate Round No. 3
jajkalope105

Pro

jajkalope105 forfeited this round.
Dwint

Con

Dwint forfeited this round.
Debate Round No. 4
jajkalope105

Pro

jajkalope105 forfeited this round.
Dwint

Con

I'm sorry my opponent chose to forfeit the debate. It could have been interesting.
Debate Round No. 5
1 comment has been posted on this debate.
Posted by kbub 2 years ago
kbub
All animals and plants on earth have evolved equally as far as humans.
1 votes has been placed for this debate.
Vote Placed by 9spaceking 2 years ago
9spaceking
jajkalope105Dwint
Who won the debate:-Vote Checkmark
Reasons for voting decision: ffs and con was only one to use sources