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Alien Earths are out there: Our home is not 'unique'

Alien

According to a certain Mr Arthur C Clarke...

"Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying."

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GBE

Re: According to a certain Mr Arthur C Clarke...

"Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying."

True for me, but not in the way that AC seemed to think. I find neither option terrifying at all.

I find the former much _sadder_ than the latter. I'm much happier thinking there is other life out there (though I'm not really sure why). Due to the vast distances involved, I don't see why we would have anything to fear from extra-terrestrial life.

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Re: According to a certain Mr Arthur C Clarke...

With apologies...

There are two type of statement. Those that can be verified and those that cannot.

Not uniquely positioned in relation to a young star, perhaps.

Evidence for Earth not being unique in general simply does not exist.

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Joke

Re: According to a certain Mr Arthur C Clarke...

With apologies...

There are two type of statistician. Those that can extrapolate from insufficient data.

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Re: According to a certain Mr Arthur C Clarke...

That's SIR Arthur C. Clarke to you, minion

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Anonymous Coward

Re: According to a certain Mr Arthur C Clarke...

All Earth-like planets are unique, just like all the other planets.

(Assuming a finite universe.)

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Re: According to a certain Mr Arthur C Clarke...

Main problem is alien scams and spyware. You think Nigerians are bad.

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2 cups oxygen

How do you keep the Oxygen in the cup?

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Re: 2 cups oxygen

Destroy the planet to make some cling film - sorted!

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Re: 2 cups oxygen

"2 cups of oxygen"

Phew : For a minute there I thought that someone was going to comment that life began with 2 girls and a cup.

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Coat

Re: 2 cups oxygen

Don't you mean 2 atoms 1 cup?

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Alien

"A thin frosting of life"

This is considered by connoiseurs to be the tastiest part.

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Anonymous Coward

Re: "A thin frosting of life"

... and particularly attractive to any wandering Mutant Star Goats in the neighbourhood.

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Boffin

Nice simple recipe

But did you check with the Magratheans?

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Joke

Re: Nice simple recipe

They couldn't afjord the fees.

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Re: Nice simple recipe

mice one, Ashton.

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Re: Nice simple recipe

Even if you could afford it, the cost would certainly put a Dent in your bank balance...

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Re: Nice simple recipe

... and the cup would have to be about a Trillian Trillian times larger than the ones in my kitchen.

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Re: Nice simple recipe

Will there be award-winning fjords?

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Re: Nice simple recipe

It will be perilous, but we will have a whale of a time playing crickit.

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I think your

spell checker needs a tuneup. "as any fule kno"?

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FAIL

Re: I think your

Google nigel molesworth and al will become clere.

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@ Martin - Re: I think your

Thank you. I've often wondered about the origin of that but never got around to actually checking. Have an upvote.

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Re: @ Martin - I think your

Until now, I'd always assumed it was "B.A. Baracus (Mr. T)" from "The A team"

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The final step

Once your new plant has cooled, carefully bounce a Mars-sized object into it.

This will, in Theia-ry, break a bit off which will then go into orbit around your new planet.

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Re: The final step

Lunatic idea

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Re: The final step

"God does not place dice with the Universe" - Einstein

"He does, however, enjoy Billiards" - Velikovsky

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Re: The final step

"carefully bounce a Mars-sized object into it."

Watch it doesn't spin off into the Milky Way though.

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Re: The final step

If you hit the planet dead-center you will be ineligible to collect your Bounty.

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Mushroom

No carbon?

I sense the rise of silicon-based life-forms...

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WTF?

And it's supposed to work?

Shove in a few million meteors' worth of the other elements and a galaxy size lump of good luck and you might stand a chance.

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Re: And it's supposed to work?

as long as it is a million to one chance it cannot fail

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Re: And it's supposed to work?

Indeed. If it's a million to one chance, then nine out of ten planetary systems will be inhabited.

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Re: And it's supposed to work?

No idea whether the simple recipe described will almost guarantee that all the other elements will naturally be present in earthish ratios but if they say that there are lots of earth size, weight, temperature, chemical composition planets out there well, that's great.

But how many will have lifeforms up and working? Is that likely, or are there just a lot of wet, rocky planets in the universe.

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Re: And it's supposed to work?

Do the lifeforms have to be up and working? Maybe they're creatures of leisure who have figured the robot problem to do the work?

And if the wet, rocky planets are anything like my backyard, they're covered in moss. <sigh>

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Re: And it's supposed to work?

@Uffish

"No idea whether the simple recipe described will almost guarantee that all the other elements will naturally be present in earthish ratios . . ."

And why would they have to be? We have evolved to require small amount so stuff like magnesium and cobalt and so forth but other animals on earth don't necessarily need those, depending on where they evolved. There's no reason to believe that, once the basic 'organic' blocks are there, life would evolve to use and require whatever spread of elements are available, just as we have and the other inhabitants of Earth have.

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Kitchen of the gods

I am sure I remember reading somewhere that not only was the Lunatic fringe important but so is a little Seasoning in the recipe, not to mention a bag full of trace elements without which even quite fundamental cells don't work.

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Headmaster

They haven't looked in the back of my fridge

Earth-esque life thrives there in the cold recesses. So far, all attempts at communication have failed. Frustrating, as I really want to ask it if the light stays on when I close the door.

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Giant Turtle

At first glance I thought that planet was sitting of top of a Giant Turtle, couldn't see any elephants though....

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The elephants are off skiing on their winter holidays.

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The elephants are off skiing on their winter holidays.

Correct. This time of year, to see the elephants, you have to observe the planets with HARPS-South.

Of course, from there they'll look upside-down. Flip the picture over and all becomes clear.

Obviously.

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About disappearing Hadean ?

so the earliest zircons showing early Earth was cool and wet don't count in this speculation ?

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Bake for a few million years?

Darn my lack of foresight. I guess I won't be using this recipe for dinner tonight.

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Re: Bake for a few million years?

Here's one I prepared earlier......

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Re: Bake for a few million years?

So. The supper's ready?

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Angel

Not for me then

I always seem to mess up on any recipe I try. This one could be a little risky!

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IT Angle

If you are lucky, a thin frosting of life may appear...

Big deal--this happens all the time with leftovers in my fridge.

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If at first you don't succeed....skip sky diving.

Only a brain dead moron would make this 'not unique' assertion....EARTH IS VERY UNIQUE.

Earth is the same distance from the Sun, yet is 200C cooler than the hottest temperature on the Moon and 75C warmer than the coolest temperature on the Moon. This is due to the atmosphere, the 310 million cubic miles of ocean and internal fission of 2 million cubic mile of Uranium and Thorium. In addition to internal heat, nuclear decay provides a stream of elemental atoms and compounds, replenishing the planet. The wingspan of flying insects and reptiles during the Jurassic was double that of today because the atmosphere was four times the current density. The atmosphere is under constant erosion from solar wind and nuclear decay. Earth had a magnetosphere that limits particle beam exposure and Ozone to limit UV exposure. There are dozens of critical components necessary for life 'as we know it' on Earth, and only a simpleton would reduce this to a few parameters.

See "Greenhouse Gas Ptolemaic Model" for more unique Earth factors.

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Paris Hilton

Re: If at first you don't succeed....skip sky diving.

I hope you're not committing suicide. Anyway, don't know whether the nuclear decay ... replenishing the plant is really a requirement, for kicking off the evolution the ionizing radiation certainly didn't harm. But why, e.g., would flying insects need larger wingspans in a more dense atmosphere?

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Re: If at first you don't succeed....skip sky diving.

why, e.g., would flying insects need larger wingspans in a more dense atmosphere?

They wouldn't, and anyway I'm not aware that the Earth did have a denser atmosphere then. Arthropods (and not just flying insects) back then did grow much larger than today but this was because the atmosphere contained a much larger proportion of oxygen.

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