If a planet has 7x the Earth's mass, does that mean it has 7x the Earth's gravity?
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11-11-2012, 12:01 AM
RE: If a planet has 7x the Earth's mass, does that mean it has 7x the Earth's
(10-11-2012 11:49 PM)Birdguy1979 Wrote:  
(09-11-2012 04:22 PM)poolboyg88 Wrote:  I was just musing over the idea that the only other "earth" like planet that humanity could ever possibly reach, would have you weigh 1000+ pounds. I'd love that situational irony. "We've found one, right on our doorstep, but can't do sh*t with it."


I hate to disagree with you, however if people on earth can survive actually weighing 1000 pounds. I am sure that we could figure out a way to launch them into space and slowly increase gravity until it matches what they will be dealing with on that planet. I'd love to see the kind of ship that could actually land on it though.
Well, the principle behind it isn't that you would "weigh" 1000 lbs, your mass is still the same mass. But the force of gravity being as heavy as it is on another planet with that type of gravity would feel like you are 1000lbs.
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11-11-2012, 08:37 AM
RE: If a planet has 7x the Earth's mass, does that mean it has 7x the Earth's
(10-11-2012 11:49 PM)Birdguy1979 Wrote:  
(09-11-2012 04:22 PM)poolboyg88 Wrote:  I was just musing over the idea that the only other "earth" like planet that humanity could ever possibly reach, would have you weigh 1000+ pounds. I'd love that situational irony. "We've found one, right on our doorstep, but can't do sh*t with it."


I hate to disagree with you, however if people on earth can survive actually weighing 1000 pounds. I am sure that we could figure out a way to launch them into space and slowly increase gravity until it matches what they will be dealing with on that planet. I'd love to see the kind of ship that could actually land on it though.
No, bones would break, muscles tear, the heart couldn't pump against that force. A person could not become acclimated.

Maybe a descendant of humans could evolve to withstand 7x earth gravity, but it would take a large number of generations of slowly increasing gravity.

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Science is not a subject, but a method.
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12-11-2012, 05:40 AM
RE: If a planet has 7x the Earth's mass, does that mean it has 7x the Earth's gravity
But landing a ship on that planet would be a piece of cake. It would be just like landing a huge magnet attracting another huge magnet, fast and violent. Hell of a landing, Bender style!

Big Grin

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15-11-2012, 01:34 AM
RE: If a planet has 7x the Earth's mass, ...
(08-11-2012 08:34 PM)Chas Wrote:  g = GM/r^2

(8^:: )

See? I can make up symbols too; but mine looks like a hockey mask, so it's pretty. Tongue

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15-11-2012, 07:48 AM
RE: If a planet has 7x the Earth's mass, ...
(15-11-2012 01:34 AM)Misanthropik Wrote:  
(08-11-2012 08:34 PM)Chas Wrote:  g = GM/r^2

(8^:: )

See? I can make up symbols too; but mine looks like a hockey mask, so it's pretty. Tongue

.................._
................/,_/)
.............../...//
........../'''./.../''`\
......./'/.../.../.../.|_
......(.(...(...(.../.)...)
.......\.....'....'...\/.../
........\................/
.........\............(
..........\.............\

Skepticism is not a position; it is an approach to claims.
Science is not a subject, but a method.
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15-11-2012, 03:12 PM
RE: If a planet has 7x the Earth's mass, ...
(15-11-2012 07:48 AM)Chas Wrote:  
(15-11-2012 01:34 AM)Misanthropik Wrote:  (8^:: )

See? I can make up symbols too; but mine looks like a hockey mask, so it's pretty. Tongue

.................._
................/,_/)
.............../...//
........../'''./.../''`\
......./'/.../.../.../.|_
......(.(...(...(.../.)...)
.......\.....'....'...\/.../
........\................/
.........\............(
..........\.............\
Well played, terse one...well played. Drinking Beverage

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15-11-2012, 04:09 PM
RE: If a planet has 7x the Earth's mass, ...
(15-11-2012 07:48 AM)Chas Wrote:  .................._
................/,_/)
.............../...//
........../'''./.../''`\
......./'/.../.../.../.|_
......(.(...(...(.../.)...)
.......\.....'....'...\/.../
........\................/
.........\.............(
..........\.............\

That was awesome, but it needed just a little fix, so I fixed it for you. But on the white background you can't see (most) of the fixes, so here's one on the light gray background that you can compare to your original:


.................._
................/,_/)
.............../...//
........../'''./.../''`\
......./'/.../.../.../.|_
......(.(...(...(.../.)...)
.......\.....'....'...\/.../
........\................/
.........\.............(
..........\.............\

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15-11-2012, 10:26 PM
RE: If a planet has 7x the Earth's mass
(08-11-2012 10:44 PM)Logisch Wrote:  neutron stars have the capability of being one of the most destructive forces in the universe. Only the possibility of that happening can be possible by extra mass the star takes in. For instance, a neighboring star where the mass is consumed or collected by the neutron star and crushes down even further on the neutron star, eventually resulting in probably one of the most spectacular things we could imagine.... but wouldn't want to be a part of.

Finish it off: that "one of the most spectacular things we could imagine" is the implosion into a black hole, which then goes on rampaging through its neighborhood of galaxies devouring stars and planets, and spewing out new 'starmatter' that can then start again to coalesce into new stars and planets. Bla-bla-bla.
It's circular. The continuous and eternal recycling of matter and energy. Driven by gravity.
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15-11-2012, 10:31 PM
RE:
(09-11-2012 06:15 AM)robotworld Wrote:  7 times? Not necessarily, but let's check

g=G(m/r^2)
Radius of Earth: 6371000m
Mass of Earth: 5.9722*10^24kg

Radius of planet: 1.9 to 2.5 times of Earth
Mass of planet: 7.1 times mass of Earth

For Earth:
g=9.813

For planet:
g= 19.302 (assume radius 1.9 times)
g= 3.9256 (assume radius 2.5 times)

So, we can't really tell for now Big Grin


What if you're a couple magnitudes off, sonny?
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