I must have. Because everyone tells me I live in a world of my own. Lol!!!!

Sry for ruining this for you, but we just don't have the technology to do so, or if we do, we can't afford to do so.

Out of...??

I bet it would be hellacious getting the permits issued!

I'll get my shovel and hard-hat...

Maybe we built Earth, Lucky. Perhaps this is all a conspiracy.

well first you'd need a big sign that says......... WANTED: CLEAN FILL DIRT

Where would we store the materials?

We would never get anyone to agree on how to build it. Politics!!!

2 words the Death Star!

I am sure you could if you could find the financing and political backing.

We could if we were all the same mentally. We would be all of the same mind, would all agree on the same plan, would agree on the method(s) and on what the final result would look like. Alas, we are human with all these differences!!! We would never agree. We don't on anything, cars, houses, politics, foods, etc. If we voted on what a new planet would look like, etc. the ballot would stretch to the moon and it would take a lifetime to even began to make the choices.

Money, technology, time, laws and the desire of many people to build one.

Because it is alot cheaper to borrow a planet from somewhere else and tereform it. (turn it into a habitable home) and one day we will.

Because the world's government would talk too long to send the paper work back

We'd have to take Earth apart to get the materials. Where would we live while the new planet is being built?

Because that is the province of the Magratheans! http://en.wikipedia.org/wiki/Magrathea

y do that when it would be easier to terrform one of the countless ones already out there?

We haven't finished destroying this one yet.

Explain how you plan to get this done, and we'll get right on it. >_>

We haven't?

We are given one and we are unable to maintain it ,then how come we can expect to build one.

What with?

Who says we can't

You need a planets worth of material to build a planet. In which case, why not settle on the planet you were going to get all that material from anyway?

Becasue this isn't "Hitchhikers Guide to the Galaxy."

Maybe we can. At least, I 'am not convinced we can't. Given unlimited time and resources, I can conceive of terraforming (planetary engineering) a planet from "space junk", such as the asteroid belt.

Well, a basic planet we could technologically build. However, the problem would be to find the resources and the manpower. Then find a way to make an atmosphere... and where to get it from...

that's a great idea. i'll bring the cement, what do you have?

we can but we don't have to. We got Mars. It's still a billion years away from becoming a galactic trashcan. We need to colonize it first and when we dump trash from using too much resources/energy, we attack the fat planet next...

Of course we could, but we need large amount of energy to build a planet.

I'm sorry if this was strictly conversational, but here we go. We could technically build a planet, but it would be more or less just a really big space station. It would only be able to be probably "tens of miles across" as Neil Degrassi Tyson discussed in Death by Black Hole and Other Cosmic Quandaries. You could maintain a spin on axis. You could orbit, but you are limited to where you can put this thing. In any two body system(Ex. Earth-Moon, Sun-Jupiter), there are five points called Lagrangian Points(L1-L5). Only one of the five points is stable enough so that you don't fly off path from the point. This wouldn't be a planet, it's just a space station, a really huge space station. I like the answers better about how we can't take care of one planet, and why not just inhabit it with the amount of materials you would need to build it.

I think that experiment already failed! Interesting thought though. http://en.wikipedia.org/wiki/Biosphere_2

You can but I am not gonna be the one trying it out. lol

Not enough legos

I've got one of Al Gore's toupees for ground cover/

Trying to get the necessary planning permission and Health and Safety sorted out is a nightmare.

Do you by any chance have a location in mind?

Better still, why don't we just take care of the planet we have so we don't have to go off and build another planet.

If the human race where at some point tecnologically capable of manufacturing a planet ( assuming you are refering to one the approximate size of a solar orbiting rock planet ranging from 40000 kilometers (25000 miles) in circumference at the Equator and 4879 kilometers (3031 miles) in circumference at the Equater) then the problem would become where you would build this. The gravitational balance of the solar system is fagile and to simply add another planet in to the mix would surely result in some catastrophic disturbances in the orbit of the neighbouring planets not only would there be a risk of causing the original planets to either veer away from or shoot towards the sun but even minor differences in there orbital patterns or distance from the sun would have massive effects on there atmosphere. So if the planet where to be built it would have to be outside of our solar system ( or any solar system ) However it would then also require an independant source of heat and light that would otherwise be produced by the sun and certain aspects of the suns rays such as the photons needed for plants to produce adenosine triphosphate, this would require inordinate amounts of energy. So to sum up buiding a planet may be possible on a technical level but fails spectacularly in both practicality and efficency.

Where are we going to buy the oxygen? Is there some sort of mass production somewhere?

Hey, Lucky Plug this into Google and hit Enter: mass of earth in tons It should look like this: http://www.google.com/search?hl=en&safe=off&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&hs=Vl2&q=mass+of+earth+in+tons&aq=f&oq=&aqi= It rounds off to 6600000000000000000000 (6.6 sextillion) short tons (a short ton = 2000 lbs). If you can round up that much dirt we can build another earth. :)  

Building a planet is no problem. The question is time frame and size. If we could play 3 ball billiards with mercury, Mars, and Venus we just might have an earth moon pair, but the surface would be a while cooling down from the aggregating collisions. and earth would likely get a lot of incoming from the smash-ups in the 3 body terra forming. you could start fresh and catch the ejected mass from a supernova but once again cooling the protoPlanet will take eons. They say that the reason earth has a molten core is due to the decay of the radio actives in there. So to have a magnetic field around the new planet you will need spin and molten Iron. But your question is not a habitable planet ... just a planet. cold Ice Balls could be assembled from comets and asteroids. Or you could just snatch a moon or 2 to to get started. and drag them into what ever orbit that you care to specify. easier to move ones that exist to where you might want them, than to start fresh. would that be the old "Planet" of the 20th century, or the newly redefined, planet of the last few years. Where Pluto is now a "sub Planet".

I KNOW HOW TO BUILD A NEW CONTINENT.