I've never said 'waahey' in my life.
It's not really like this you know:
It's not really like this you know:
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PMSL Do go on
What, so we're never gonna met Klingons, Daleks or ET?Ok so here goes, strap yourselves in it's going to test (if not bend [if not break]) your mind.
So we live on a planet in a solar system populated by other planets which are uninhabitable either because a) they're far too hot, b) far too cold, c) made of gas or d) a combination of the three. Only here - on earth - are the conditions 'just right' to sustain life, hence the planet is in what is known as the "Goldilocks" (or Habitable) Zone. Current estimates set the number of planets in the correct position etc. with respect to ther native star as around 500 million in the Milky Way galaxy alone. So life, maybe not as we know it Jim, is certainly theoretically possible all over the universe.
Life on earth came about by means of a bunch of coincidences. Not only was the planet created within the correct number of astronomical units from its star, but also the conditions were present to form a hydrosphere (and later an atmosphere). This would most likely have occurred several billions of years ago in earth's case - possibly once it had solidified - as a result of a coming together with an icy or other such asteriod or stellar material. Crucially though, other (possibly the same) impact events would also have needed to bring with them certain amino acids which are the building blocks of life itself. The rest - dinosaurs followed by more contemporary [measured in millions of years] evolution - is, as they say, history.
Given that all the material in the universe is generally held to have existed in a single mass immediately prior (which in mathematical terms could be billions of years or a fraction of a second) to the Big Bang itself, the overwhelming likelihood is that the building blocks of life described above are scattered among the cosmos or have already found their way to planets in the Goldilocks Zone of vast quantities of planets. The extremely unlikely possibility is that all of that material found its way to earth and ours is the only life-sustaining planet anywhere. Ever.
Finally, here's why you'll never see an alien. This bit is my invention and I claim it. When you lot were talimg aliens while I listened to the pod earlier, it is clear you were thinking of the colloquial greys or some other such Hollywood creation but what the conversation overlooked is that these processes take place over millions or billions of years. Put in context then, the earth is generally accepted to be 4.5 billion years old with a shelf-life of another 5.5 billion years. The universe itself is fourteen billion years old and the human race has existed for around 200,000 years. Put another way, this is 0.004% of the time the earth has existed. Time is a major factor here and time extends almost infinitessimally in both directions to the point that the odd 200,000 years here and there become pinpricks in a piece of cloth the size of Australia. So the question one needs to ask is not whether aliens could exist becuase the answer is undeniably yes - they may be amoeboid, lizards, humanoid or even pink dogs but they are (or have been or will be) out there. The more relevant question is whether more than one civilisation could both evolve and [just one has to do this] develop the technology to cross what are vast interstellar distances (which, lest we forget, as a race we're shit at - I mean we've only just discovered how to make electric cars ffs) for a visit BUT before both races are extinct. I find myself sadly reasoning that given the size of the universe and sheer mind-numbing expanse of time, this probability is low.
The more relevant question is whether more than one civilisation could both evolve and [just one has to do this] develop the technology to cross what are vast interstellar distances (which, lest we forget, as a race we're shit at - I mean we've only just discovered how to make electric cars ffs) for a visit BUT before both races are extinct. I find myself sadly reasoning that given the size of the universe and sheer mind-numbing expanse of time, this probability is low.
However, having said all of this, we haven't thrown in the topic of potential time travel or alternate universes.
Depends on the concept of time we're going with, in a Linear concept you wouldn't be able to do that as you would've never have invented the time machine allowing you to do afore mentioned deed.Here's one for you, what would happen if you invented time travel and went back and killed your own father, or yourself - would you simply wink out of existence?
Depends on the concept of time we're going with, in a Linear concept you wouldn't be able to do that as you would've never have invented the time machine allowing you to do afore mentioned deed.
Have you guys ever seen Quantum Leap? The TV series ever.