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post #51 of 152
Quote:
Originally Posted by Stuuut View Post

So if its suitable for life and has water why wouldn't there already be life on it?

Consider the mass of the planet.

Gravitational force is the result of the mass of the planet, the mass of the object attracted to it and the gravitational constant.

F = (mMG)/r^2. If M, the mass of the planet, it too great, then gravity would be too strong for life to start there.

Also you must take into account that the probability of whatever starts the chemical processes of life may have already happened and there may be bacteria/single celled organisms on that planet.

Or, alternatively, the probability of life starting is so very low that you must consider billions upon billions of planets before you find life, let alone a planet that is habitable. Which creates a confusing situation - since we came here by chance it's even less probable that we find life.

It's like getting the number 1 on a trillion sided dice twice in a row. We are one of the 1s, it's not likely we'll find another any time soon. I hope that makes it clearer? tongue.gif
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post #52 of 152
Quote:
Originally Posted by kennyparker1337 View Post

Gravity is dependent upon mass, not size. So if this planet's density was much less than Earth's it could be much larger and still have close to normal gravity.

Surface gravity is dependent on both.

A planet of similar mass to earth but of significantly different radius will have significantly different surface gravity.
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post #53 of 152
Quote:
Originally Posted by Edge Of Pain View Post

Consider the mass of the planet.
Gravitational force is the result of the mass of the planet, the mass of the object attracted to it and the gravitational constant.
F = (mMG)/r^2. If M, the mass of the planet, it too great, then gravity would be too strong for life to start there.
Also you must take into account that the probability of whatever starts the chemical processes of life may have already happened and there may be bacteria/single celled organisms on that planet.
Or, alternatively, the probability of life starting is so very low that you must consider billions upon billions of planets before you find life, let alone a planet that is habitable. Which creates a confusing situation - since we came here by chance it's even less probable that we find life.
It's like getting the number 1 on a trillion sided dice twice in a row. We are one of the 1s, it's not likely we'll find another any time soon. I hope that makes it clearer? tongue.gif

Still no way to prove that we didn't start as a contaminant in a comet...
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post #54 of 152
Quote:
Originally Posted by Blameless View Post

Surface gravity is dependent on both.
A planet of similar mass to earth but of significantly different radius will have significantly different surface gravity.

This is true because F = mMG/r^2 where r^2 is the square of the distance to the centre of the mass.

EDIT:
So a planet with the same mass as Earth but twice the diameter (and thus radius) will have a force of gravitational attraction 4 times smaller than Earth (r is squared, 2^2 is 4)
Edited by Edge Of Pain - 11/9/12 at 3:51pm
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post #55 of 152
Quote:
Originally Posted by Foxrun View Post

Only to find out they are looking right back at us
Before we know it, we'll be trading immigrants/emigrants back and forth. "MOVING TO SUPER-EARTH, YOLO!"
 
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post #56 of 152
Quote:
Originally Posted by un-midas touch View Post

Still no way to prove that we didn't start as a contaminant in a comet...

...Wasn't really discussing that but that's true also I guess.
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post #57 of 152
Quote:
Originally Posted by Edge Of Pain View Post

...Wasn't really discussing that but that's true also I guess.

I know, but I feel it can be noted that if we did start as a contaminant in a comet that it would suggest that life existed somewhere else before here, and thus doubling the chances that life exists elsewhere (sort of)
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post #58 of 152
Quote:
Originally Posted by Blameless View Post

Surface gravity is dependent on both.
A planet of similar mass to earth but of significantly different radius will have significantly different surface gravity.

Quote:
Originally Posted by Edge Of Pain View Post

This is true because F = mMG/r^2 where r^2 is the square of the distance to the centre of the mass.
EDIT:
So a planet with the same mass as Earth but twice the diameter (and thus radius) will have a force of gravitational attraction 4 times smaller than Earth (r is squared, 2^2 is 4)

All very true. I am no physicist. thumb.gif

My point was though, just because it is bigger doesn't always mean more gravity.
post #59 of 152
Quote:
Originally Posted by Edge Of Pain View Post

This is true because F = mMG/r^2 where r^2 is the square of the distance to the centre of the mass.
EDIT:
So a planet with the same mass as Earth but twice the diameter (and thus radius) will have a force of gravitational attraction 4 times smaller than Earth (r is squared, 2^2 is 4)

According to an earlier post, the planet is roughly 7 times our size (assumably based on wobbling effect). Given that all planets are formed in similar circumstances (debatable of course, but the most plausible) from asteroids, the density would be similar under ideal conditions. So take into account the mass and the distance from the center.
Quote:
Originally Posted by un-midas touch View Post

I know, but I feel it can be noted that if we did start as a contaminant in a comet that it would suggest that life existed somewhere else before here, and thus doubling the chances that life exists elsewhere (sort of)

All studies/disciplines have indicated that there are multiple areas in the universe that have life, inclusive of theology.

I just want to know who pushed the early human mountain climbers into the ice crevaces, that we are now finding. What a terrible way to get rid of the evidence of foul play.
    
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post #60 of 152
Quote:
Originally Posted by un-midas touch View Post

I know, but I feel it can be noted that if we did start as a contaminant in a comet that it would suggest that life existed somewhere else before here, and thus doubling the chances that life exists elsewhere (sort of)

There is no "chance" that life exists elsewhere. It does.

The real question is, how do we come in contact with the extraterrestrial life.
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