Mega-Earth found and it's 17 times Earth's mass
- Thread starter Old Man
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It doesn't matter what the composition is - it's 17 times the mass of the Earth.
It's not so much that mavity is pathetically weak (it is weak, but that doesn't matter in this example). It matters that while this planet is 17 times the mass of Earth, it's also very very much larger than Earth too.
Earth's mass = 5.97219 × 10^24 kg
Radius of Earth = 3,959 mi
Super Earth mass = 17x 5.97219 × 10^24 kg = 1.01527x10^26
Super Earth Radius = 9000 mi
Super Earth Radius = 2.27 Earth Radius
Super Earth Mass = 17 Earth Mass
17/2.27^2 = 32.28 m/s^2
So the strength due to mavity of this planet is 3.3 times greater than that of our own planet. Just imagine everything you do being 3 times heavier. If you were to live on this planet, a simple trip would mean death for most people
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Shhhh!!!! actually they're tall and mighty we are just ridiculously long because of our rubbish low G!!!
Soldato
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Yes, for some reason I read 'size' instead of mass in the subject line. Obviously if they have measured the mass, the composition is irrelevant since they already know it's 17 times the mass.
An army of Tiny Trips
You're assuming that 10^24 kg is a constant in the galaxy of the mega earth. Chance are, it won't be
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I'm assuming that's the calculated mass of the planet - which it is: http://arxiv.org/pdf/1405.7881v1.pdf
Masses are intrinsic properties of all matter. It's constant. The only time mass isn't constant is when objects travel near the speed of light (This'll be in any Special Relativity book).
Also, I have faith in my value for g because it's very similar to what that paper calculated.
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Soldato
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If we moved and managed to adapt, we would be super fit afterwards for sure. then coming back to earth we would feel super light.
indeed, there's a difference between mass and weight and not all people know it.
mass is the (almost always) constant figure that tells us the weight of the body ignoring mavity
Weight is the product of mass multiplied by the mavity as per the below equation in basic physics
W=mg
(i think thats right)
W = Weight
m = mass (measured in g/ kg etc...)
g = mavity (measured in Newtons)
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Most people wouldn't be able to handle that sort of weight. Picking something off the floor would be like squatting with 160kg on your back, something a very small percentage of the population can do. Only weight lifters would be able to deal with that sort of load.
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Just like Dragonball Z!
I agree that it would almost certainly be an issue and make it potentially impossible for humans from earth to inhabit this environment natively.
The point I was trying to make is that it shouldn't be a big enough issue to prevent life from evolving there, obviously during evolution this extra mavity would be an environmental constant that the process of evolution would simply deal with and evolve accordingly too.
The point I was trying to make is that it shouldn't be a big enough issue to prevent life from evolving there, obviously during evolution this extra mavity would be an environmental constant that the process of evolution would simply deal with and evolve accordingly too.
Soldato
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it is very true that some "training" would be needd before a theoretical move there.
a = GMp/R²
a = acceleration due to mavity
G = Gravitational constant = 6.67×10−11 N·(m/kg)2
Mp = Mass of the planet = Earth x 17 = (5.97219 × 10^24) x 17 = 1.0152723 x 10^26 kg
R = Radius of the planet = "18,000 miles in diameter", 18,000 Miles = 28,968,192 metres / 2 = 14,484,096m
Slap all that into the above formula and we get:
32.28m/s²
Earth is 9.98m/s²
So it has a gravitational pull at its surface a little over 3x that of Earth. No pizza'ing would occur. It'd just be rather uncomfortable.
EDIT - Bah, exhashdotdot already did it, that's what I get for leaving this open in a tab, then answering the phone and forgetting about it
a = acceleration due to mavity
G = Gravitational constant = 6.67×10−11 N·(m/kg)2
Mp = Mass of the planet = Earth x 17 = (5.97219 × 10^24) x 17 = 1.0152723 x 10^26 kg
R = Radius of the planet = "18,000 miles in diameter", 18,000 Miles = 28,968,192 metres / 2 = 14,484,096m
Slap all that into the above formula and we get:
32.28m/s²
Earth is 9.98m/s²
So it has a gravitational pull at its surface a little over 3x that of Earth. No pizza'ing would occur. It'd just be rather uncomfortable.
EDIT - Bah, exhashdotdot already did it, that's what I get for leaving this open in a tab, then answering the phone and forgetting about it
You sound like a fun guy...
will you come for a beer with me when im in London ?
We can discuss h over some H.
then bum
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The image we'd see of it if we could would only be 560 years old - a mere blink of an eye astronomically speaking.
Brain fail
I thought millions of light years
And worst thing is I know how far andromeda galaxy is and size of our galaxy. And obviously that this planet must be on ours
Idiot
EDIT - Bah, exhashdotdot already did it, that's what I get for leaving this open in a tab, then answering the phone and forgetting about it
Snooze you lose.
Does this mean on average it'll hang lower on this superearth?
