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Earth-like planets may be more rare than thought
Nature Magazine ^ | 30 July 2004 | Philip Ball

Posted on 07/30/2004 11:12:50 AM PDT by PatrickHenry

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To: Pres Raygun
This is the point of Rare Earth. The idea behind the Drake equation properly applied, means that the habitable zones of galaxies, combined with the number of stable stars, with gas giant in circular orbits, combined with the number of solar systems with rocky planets with the right atmosphere and the correct distance from their star, plus dozens of other factors necessary for advanced life forms, whittles away at the billions and billions of stars, until it becomes improbable that there are other inhabitable planets let alone ones with advanced life.

There are many assumptions here. IMHO, "Rare Earth" falls in the realm of sensationalism and/or junk science.

I'm not sure I understand what you were trying to say with that statement.

Here was my statement: For the record, I do not believe there are life bearing planets out there; however, I do suspect there are.

What I was trying to say, was that I do not believe in ET. However, I suspect there may be other life out there. In other words, I will let the evidence speak for itself as we continue to learn more about this universe.

161 posted on 08/01/2004 10:07:23 AM PDT by RadioAstronomer
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To: RadioAstronomer
There are many assumptions here. IMHO, "Rare Earth" falls in the realm of sensationalism and/or junk science.

I realize that this is not exactly the forum for discussing complicated scientific issues, but I am surprised that you think so little of Brownlee and Ward. My understanding is that they are well respected in their fields. Not every astronomer, geologist, astrobiologist or astrophysicist may agree with their conclusions, but I doubt they would accuse Brownlee and Ward of pushing junk science. I agree that the field is open to speculation because the whole field of astrobiology is rather young, but if Rare Earth is junk science, then so is SETI and the Drake equation.

What I was trying to say, was that I do not believe in ET. However, I suspect there may be other life out there. In other words, I will let the evidence speak for itself as we continue to learn more about this universe.

Thanks for the explanation. That is a reasonable position to take since there is at this time no evidence whatsoever of extra-terrestial life. Since disproving the existence of extra-terrestial life is an impossible task, even if no extra-terrestial life exists, then the logical position to take is to keep an open mind.

162 posted on 08/02/2004 12:19:58 AM PDT by Pres Raygun
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To: Pres Raygun
I realize that this is not exactly the forum for discussing complicated scientific issues, but I am surprised that you think so little of Brownlee and Ward. My understanding is that they are well respected in their fields.

Sigh. I was too harsh in my statement. What I am trying to convey is that people seem to latch onto each extreme in this debate. I decided to take a "wait and see" attitude. This is why I think SETI is so important. It is win win science. Either they are all over, or they are damn hard (or impossible because they don't exist/out of range time etc.) to detect. Both cases lend to further defining our place in this universe.

163 posted on 08/02/2004 5:30:19 AM PDT by RadioAstronomer
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To: RUCKUS INC.

But isn't it just possible that God did not reveal to us absolutely everything that He did in the Bible. It doesn't say in the Bible that He did or He did not create other planets. The singular usage for earth doesn't prove He didn't. Maybe He gave a different name to the other planet(s) that He created. We just don't know at this point. For either religious people or scientists to suggest that we do know is ridiculous.


164 posted on 08/02/2004 6:41:20 AM PDT by stremba
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To: RUCKUS INC.
"In the beginning God created the heavens (plural) and the earth (singular)"

This has made a lot of people very angry and been widely regarded as a bad move.

165 posted on 08/02/2004 6:45:27 AM PDT by dfwgator (It's sad that the news media treats Michael Jackson better than our military.)
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To: Vineyard

Of course, in order for the earth to be the only planet that has life, you have to eliminating 99% of all stars is insufficient. If you assume that the milky way has ~10^8 stars and that there are maybe 10^8 other galaxies out there, then there are 10^16 stars to be considered. If you eliminate 99% of them that leaves 10^14 planets which still could contain life. You'd have to eliminate 99.99999999999999% of the stars. So far, nobody has given convincing evidence for elimination of that high a percentage of stars. Life may not be very common, but it doesn't have to be common for there to be other life besides that on earth.


166 posted on 08/02/2004 6:47:20 AM PDT by stremba
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To: PatrickHenry
Only then can we know how unusual we really are.

?

167 posted on 08/02/2004 6:57:28 AM PDT by AndrewC (I am a Bertrand Russell agnostic, even an atheist.</sarcasm>)
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To: RUCKUS INC.
that the more we learn the more complex everything becomes?

Not at all!!! For example, we used to believe that the force that drove a compass needle, the force that destroys your house when it's hit by lightning, and the force that presses back against you when you push on a wall were all different things. Now as science has advanced and we've learned more, we learned that all of these things (as well as many others) were simply different manifestations of the same thing, namely the electromagnetic force. Furthermore, we learned that all of these phenomena can be described by a set of FOUR EQUATIONS. In fact, adding the equation for universal gravitation, we've learned that most of the phenomena of human experience can, in principle, be described by FIVE equations. The entire history of scientific inquiry has been one of simplification and unification, not one of increasing complexity. It may seem, to a non-scientist, that things are more complex, but to scientists this is not the case.

168 posted on 08/02/2004 7:00:29 AM PDT by stremba
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To: stremba; All

Is Mars mentioned in the Bible???


169 posted on 08/02/2004 8:17:04 AM PDT by KevinDavis (Let the meek inherit the Earth, the rest of us will explore the stars!)
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To: stremba

In a way, you are proving my point. With things like gravity or lightning, the more we've learned about them, the easier they are to understand. But with things like DNA, the Cell, and the unique congruence of "coincidences" that occur on earth in a way that is capable of sustaining so much life, the more we learn, the more complex things get.


170 posted on 08/02/2004 8:27:34 AM PDT by RUCKUS INC. ("Wow, what a crapweasel." - Frank_Discussion)
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To: dfwgator

Widey regarded by whom? Did I miss something?


171 posted on 08/02/2004 8:32:02 AM PDT by RUCKUS INC. ("Wow, what a crapweasel." - Frank_Discussion)
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To: stremba

Not only is it possible that God did not reveal to us absolutely everything that He did in the Bible, but I know He didn't.

But that doesn't prove that He did. I can only rely on what He said He did. Not on what He might have done and it looks like the latest science (i.e. this article) seems to support the Bible's perspective that there is only one earth...


172 posted on 08/02/2004 8:35:33 AM PDT by RUCKUS INC. ("Wow, what a crapweasel." - Frank_Discussion)
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To: RightWhale

"Something with more moving parts would have more degrees of freedom. More degrees of freedom implies more possible configurations at any given time which would lend itself to a stochastic approach"

So a watch (more moving parts) is more likely a result of chance than a tombstone? Obviously both items had a designer... Why does your theory hold true? Because you can back it up by saying stochastic approach? I think you know that the route of the argument is that you don't admit the existence of a creator, therefore you theorize from that point of reference.


173 posted on 08/02/2004 8:52:04 AM PDT by RUCKUS INC. ("Wow, what a crapweasel." - Frank_Discussion)
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To: RUCKUS INC.

So then, God didn't create gravity and lightning??? You can't have it both ways.


174 posted on 08/02/2004 8:52:46 AM PDT by stremba
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To: RUCKUS INC.

But my point was that we really can't claim knowledge of whether or not life exists on other planets, either from a religious or a scientific perspective. I think you've just confirmed that point, at least from the religious perspective. God has given us no reason to believe that there are other planets with life. On the other hand, He has not specifically told us that these other life-bearing planets don't exist.


175 posted on 08/02/2004 8:57:32 AM PDT by stremba
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To: RUCKUS INC.

It's a line from "Hitchikers Guide to the Galaxy."


176 posted on 08/02/2004 9:00:09 AM PDT by dfwgator (It's sad that the news media treats Michael Jackson better than our military.)
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To: RUCKUS INC.

The other choice is organic. Stochastic or organic.


177 posted on 08/02/2004 9:31:37 AM PDT by RightWhale (Withdraw from the 1967 UN Outer Space Treaty and establish property rights)
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To: stremba

No, I'm not having it anyway. I believe that God created everything, the simple and the complex. I just happen to believe that the complexity of the universe would lead a reasonable person to see taht it was designed.


178 posted on 08/02/2004 9:59:50 AM PDT by RUCKUS INC. ("Wow, what a crapweasel." - Frank_Discussion)
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To: stremba

Total Non-sequitur...


179 posted on 08/02/2004 10:01:45 AM PDT by RUCKUS INC. ("Wow, what a crapweasel." - Frank_Discussion)
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To: stremba; All

I don't think that other planets in the solar system is mentioned in the Bible either.


180 posted on 08/02/2004 10:18:50 AM PDT by KevinDavis (Let the meek inherit the Earth, the rest of us will explore the stars!)
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