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# [ESO] Three Planets in Habitable Zone of Nearby Star - Page 2

Quote:
Originally Posted by aroc91

Not necessarily. Surface gravity increases in proportion with mass and inversely proportional with radius.

For example, "Gliese 163 c is a super-Earth with a minimum of 6.9 Earth-masses and a diameter between 1.8 and 2.4 times that of Earth"
Using the equation F= GM/r^2, you can figure out the force of gravity at the surface. G is Newton's constant, M is the mass of the body in kilograms, and r is the radius at the surface in meters.

Equation for Earth-
F = (6.63 x 10^-11)(5.97219 x 10^24)/(6378100^2) = 9.73 m/s^2, which is off a bit, but it's close enough.

The equation for Gliese 163 c is (averaging the diameter estimates) -
F = (6.63 x 10^-11)(4.1208111 x 10^25)/(13394010^2) = 15.22 m/s^2

So, while its mass is 7x that of Earth, its gravity isn't even twice as strong.

Excel says your fine with the math for Earth but Gliese should be 15.23 (rounding).

When we say ~7 earth masses, how is that guesstimated?
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That's awesome news! I really do wonder if there is life near us, a race evolving just like us, They are maybe a bit ahead of us or behind us, looking through a telescope, having those EXACT same articles posted "Breaking news, an Inhabitable star was found orbiting a sun, with what appears to be a black and white moon around it!" And people on that planet are also talking about how they wonder if our planet is inhibited or not. But neither one of the races will know for sure until a bit later in to the future where one or the other makes the breakthrough in technology allowing for communication or contact.
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Quote:
Originally Posted by CyberWolf575

That's awesome news! I really do wonder if there is life near us, a race evolving just like us, They are maybe a bit ahead of us or behind us, looking through a telescope, having those EXACT same articles posted "Breaking news, an Inhabitable star was found orbiting a sun, with what appears to be a black and white moon around it!" And people on that planet are also talking about how they wonder if our planet is inhibited or not. But neither one of the races will know for sure until a bit later in to the future where one or the other makes the breakthrough in technology allowing for communication or contact.

I am not any kind of expert in this field, but it works kind of like this:

We started broadcasting radio signals around 1920. Therefore, 2013-1920 = 93 lightyears worth of travel distance that our first signals have traveled. While any race 93 lightyears away will probably only hear something like white noise, it will be on a particular frequency only which indicates to them that it came from an advanced race.
(This is assuming they have a seti like program that happened to be listening at that frequency)

The reverse is true for us. Since we have not received any signals that we know of, its likely that a more advanced civilization is very far away. However, if we receive a signal that came from 200 lightyears away, that means they are about 107 years more advanced than us.

I intended this to be more in depth but my head started hurting trying to figure out how to explain it without writing a 5 page report.
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Quote:

Excel says your fine with the math for Earth but Gliese should be 15.23 (rounding).

When we say ~7 earth masses, how is that guesstimated?

As far as I know, they measure how much the star moves when the planet orbits around it. Bodies orbit around their combined center of mass, so if you know the distance between the center of mass and the center of the star, you can compare the mass of the planet to the mass of the star. I'm not sure how it's done mathematically, though.

Edited by aroc91 - 6/25/13 at 3:45pm
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The PDF explains it through the Doppler effect (red shift) as I understand it. Leverage by gravity - mass effect (if you had a long enough lever you could move the universe)? Is that a fair "layman" understanding of the measurements?

edit: managed to put mass effect in a post
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Quote:
Originally Posted by LB11

Im sure there are many scientists that think that way, but I think its more a case of that's the most logical place to look for life since we know for sure those conditions can produce life.

It's the most obvious and likely route to at least find life that would be possible to measure with our senses and tools that we have on hand. Not like we'll get there any time soon anyways. We're better off looking at more relevant objects like Mars or the moon of Io to find something.
Quote:
Originally Posted by LB11

I am not any kind of expert in this field, but it works kind of like this:

We started broadcasting radio signals around 1920. Therefore, 2013-1920 = 93 lightyears worth of travel distance that our first signals have traveled. While any race 93 lightyears away will probably only hear something like white noise, it will be on a particular frequency only which indicates to them that it came from an advanced race.
(This is assuming they have a seti like program that happened to be listening at that frequency)

The reverse is true for us. Since we have not received any signals that we know of, its likely that a more advanced civilization is very far away. However, if we receive a signal that came from 200 lightyears away, that means they are about 107 years more advanced than us.

I intended this to be more in depth but my head started hurting trying to figure out how to explain it without writing a 5 page report.

My only issue with this is that no one truly knows what an intelligent signal will look 93 years later once it gets there. It has to travel that far for that long and no one can say what the end result would look like on the far side or if it would be distinguishable from the rest of the noise out there.

Point being, we are more isolated than we can possibly imagine and this universe is way too big to comprehend in relative terms. If there is other intelligent life the chances are highly weighed on the side of us never coming into contact with it, and I mean never as in it won't happen of our doing before we are extinct.
Edited by AJR1775 - 6/25/13 at 4:20pm
The maths make my head spin, but this truly is an exceptional find and very interesting! Thanks for posting.
I call dibs on the one in the middle.
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Quote:
Originally Posted by EniGma1987

I still take issue with the fact that all these articles and scientists in general insist that the basis for life must conform to what humans need and if something does not contain those things then it cant possibly be alive or contain life. Such a narrow view of the universe.
Wrong.

They are not assuming that at all. These ones just happen to be looking for planets similar to ours, to find life similar to ours. Nobody is excluding the possibility of life that is NOT like ours, the problem is that we don't know what to look for, so how can you look for it?

Every other planet in a reasonable range of the parent star gets at least a quick once over, to see if we notice any of the very general signs of intelligent life. However, since we cannot possibly be sure what is possible other than what we ourselves are, that is what we focus on.

Doesn't do us any good to find a planet capable of supporting silicone based lifeforms (or whatever), if we can't even so much verify anyone is there, let alone ever hope to step foot on it.
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