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It's not a worthwhile endeavor. If you could harness and assemble the resources it'd take, making a whole planet might be the silliest thing you could possibly use them for. There are plenty of planets and moons we're not using. With a planet's worth of resources you could enlarge and terraform Mars, and still have most of your nickel and iron left over.

I have recently learned about magnetic induction and that it may not be earth generating our field as much as the suns magnetism linking to earth.

You can take a strong magnet then hold a piece of ferrous metal a bit away from it and it will act like a magnet itself just by being in the field.

So maybe Mars lost more than a hot core.

*fringe theory Mars liquid core was used to construct the moon which we have now to convey a whole civilization to a new planet.

Nope not because we don't have the technology ,but because we can't work together long enough for something that big

"The total mass of all the asteroids [in main asteroid belt] combined is only 3% that of Earth's Moon.". [Source

Could steal some moons from other planets.

Where would you put your planet?

Millions. Good luck finding the material as well

Short answer stupid, considering current technology and knowledge.

long answer- First we need to create a core of metal which rotates and creates a lot of heat and energy which does not cool down rapidly. Too fast or too slow rotation will not support the creation of magnetic field to protect planet from outer radiation and mantle followed by crust where life could be a possibility. Suppose we achieved all those things. Here come a tough part.

Once the crust is created we need to also carefull design how tectonic plates are placed, where we need to give escape vents for lava to disperse as excess energy. Deep valleys for oceans. We need mountains, rivers, valleys etc (no deserts pls). For different types of life. We need to carefully design the axis, speed and tilt of rotation of the planet, for which we need a mechanism which can control core of planet from outside.

A viable atmosphere which can have exact atmospheric pressure, power to block radiations, meteors and other objects.

These things are random and rarest of rare occurrences in universe. so humans cannot create planets. Because to create a planet we need to be capable to creating the very foundation of these things. We need to create a new physics, chemistry and biology for new planet.

So hypothetically do we have the knowledge? Yes. Orbital mechanics and the force need to apply to each object are pretty easy math to calculate once we know their mass and current orbit.

However its not a practical exercise.

The entire mass of the asteroid belt is only 3% the mass of the moon. And some 40% of that is Ceres alone with 62% being in the largest 4 asteroids. So you need a lot more mass to make anything approaching a planet. The larger the object the a harder it is for us to move.

It also takes a lot of energy to redirect masses like that, and time for the orbits to coincide and come together in a manner thats not gong to cause catastrophic break ups sending rock where we dont want it. Yes we can minimize the collision force, but that takes more energy. We dont have the technology to manipulate hundreds of thousands of rocks and get them into a single area in any kind of reasonable time scale. Hundreds of years if not longer. Its not just the shear volume its finding a way to apply enough energy to the larger objects to change their orbits significantly in a life time.

But u can define and design everything u want, it would take 100's of years tho!

There is nothing in physics that prevents us from piling up enough rock until it turns into a planet, but honestly that would be a really stupid waste of resources

Yes we are!

Only if they live on Magrathea.

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We could for sure; but only if we were hypothetically capable of it.

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You're thinking of Ozone, which will be synthesized via photochemistry and lightning once an atmosphere is in place.

Edit: we also produce it as a lower-atmosphere pollutant, so maybe we'll be good if we run a coal plant on Mars for a few centuries 🤷‍♂️

"Energy is finite" but Jupiter and Saturn are literally made of mostly Hydrogen. Even ignoring stellasers and solar sails, there's enough fusion fuel to last a long time, and more than enough for a continuous Kuiper belt mining operation.

It's fascinating that Falcon 9 has become the gatekeeper for rocket designs. If your new rocket can't either be competitive with F9, or do something useful that F9 can't, it's going to be a hard sell to bring it to market.

But first, you need to find Unobtainium to actually execute your idea. 👀

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