Earth is about to die? Relax, we've got spares.

[.Ultima.]

I hope this doesn't give people the idea thats its okay to trash the planet.

[Noo Monkey]

Screw this, we'll all be dead by the time our Earth 'splodes or whatever.

[Proline]

Originally Posted by ikkuh2

The equation is incomplete, but it's damn close. F=(G*M1*M2)/r^2
The mass of both the planet and a person must be taken into account. Also, the gravitational acceleration doesn't have to be the same as on earth, so the radius can be very different.

No it's not.

We know F = mg, so we can write the equation as:

mg = GMm/r^2

Where m = mass of a small object, G = Newton's constant, g = gravitational acceleration, r = mean radius and M = mass of Earth. That being said, if you divide both sides by m, you get the equation:

g = GM/r^2

In essence, when finding the acceleration due to gravity on a planet's surface, the mass of the second object, which is our mass in this context, is negligible.

Also, the acceleration of gravity is an important factor. Your mass will be constant where ever you go, however, the force of gravity acting on your body depends on the acceleration it has on your body, hence the reason why we have the equation F = mg, where the force of gravity is the product of mass and acceleration due to gravity. It's true that the acceleration due to gravity of the new planets doesn't have to be the same, but go maintain the same gravitational force that we have here on Earth, a radius of 1.733 is ideal.

[Snow Candy]

If Earth does have a twin, it'd be weird and yet cool and at the same time......kinda shocking me. But I don't know. Sounds convincing as well but at the same time it's like 'Are they really sure?' If you know what I mean.

[InfiniteTwilight]

The discovery seems pretty cool, but the idea of having to start over on another planet seems a little odd if it happens. All the construction and whatever to do would take a while as well as sending people over there would be bleh. Plus, Earth could probably be gone by the time we finally send people over there.

[Jet]

Even if our bodys could stand the gravity, whats the point of going to another planet just because something isnt going right on our Earth. Screw our Earth up, go to another Earth, and then screw that one up, and so on, and so on.
Still, the discovery is interesting.

[Phoenix]

Well, I can tell you that if I know the Earth is going to go kapoot, and there's a spaceship taking humans someplace else, I am going to be on that spaceship.

[Roxas9001]

Originally Posted by insoulent

we can finally leave christians back for good

What do u mean by that?!

[Zero Inferno]

Earth isn't about to die. At least, not by natural causes. It's got a good 5 Billion years left before it's engulfed by the sun. That's of course considering we don't render it uninhabitable and/or blow it up

That's all well and good, but it'll take us hundreds of years just to get there, regardless of where this planet happens to be.

And when we do get there. If, by any chance, we go to this planet because we blew up Earth or made it uninhabitable, we still wouldn't learn anything. We'd just to the same thing if not quicker to this planet and then move onto another one.

[Phoenix]

Also, someone brought it up, I'd like to emphasize it.

These things are millions of light years away, i.e. we're never getting to them.

[ikkuh2]

Originally Posted by Domon Kasshu

No it's not.

We know F = mg, so we can write the equation as:

mg = GMm/r^2

Where m = mass of a small object, G = Newton's constant, g = gravitational acceleration, r = mean radius and M = mass of Earth. That being said, if you divide both sides by m, you get the equation:

g = GM/r^2

In essence, when finding the acceleration due to gravity on a planet's surface, the mass of the second object, which is our mass in this context, is negligible.

Also, the acceleration of gravity is an important factor. Your mass will be constant where ever you go, however, the force of gravity acting on your body depends on the acceleration it has on your body, hence the reason why we have the equation F = mg, where the force of gravity is the product of mass and acceleration due to gravity. It's true that the acceleration due to gravity of the new planets doesn't have to be the same, but go maintain the same gravitational force that we have here on Earth, a radius of 1.733 is ideal.

R isn't radius, it's the distance between the two objects, so even when 10 km away from earth you can calculate it, but you have to use f=(G*M1*M2)/R^2.

[Proline]

Yes, that's true. The variable r represents the distance between two objects from their centres. In this case, we are using the mean radius since the second object is on the surface of the planet since the mean radius of Earth is from its centre to its surface, hence the reason why I made r the radius..

As I said before, the equation F = GMm/r^2 is the universal equation for gravity, however we also know that F = mg. Therefore, we can equate mg and GMm/r^2 for reasons obvious. To find g, we assume that the second mass, m, is located on the surface of the planet and we can divide both sides by m, giving us an equation for the acceleration due to gravity.

You can test this for yourself by using the correct values to see if you get 9.81 m/s^2.

[Clone]

If we get to these planet will the still be their? didn't somone say their millions of light years away? and if it is possible to make warp speed is that time travel or not? lol off topic.

Any way new planets would be cool, just hope their no strange alines that would wont to eat us, and do we know if these planets have oxygen?

[*~NeoAdamus~*]

depends, doesn't water, trees, and clouds suggest signs of Oxygen

[Clone]

well then obviously their is oxygen, if the earth like planets r identifed but having trees and water.