7

In the mare magnum of the Internet, one can find anything, literally anything. Well, it looks like someone created also a habitable zone calculator*! The calculator takes as input the luminosity of the star, which you don't give. However you give the estimated masses, thus we can estimate the luminosity of the star using the mass-luminosity relation $L\...


7

You may want a star in order to have liquid surface water. Without sunlight, objects in space get really, really cold. Consider that Neptune, which is close enough to our Sun to be illuminated, is still far enough away that its surface averages -353 Fahrenheit. Neptune's core is as hot as the surface of the Sun, too! But because it's so far away from the ...


7

Although the orbit of Earth may be affected, it's not only its orbit that we have to worry about. Jupiter's location creates various points where asteroids collect naturally - as is evidenced by the following diagram: Trojan, Hildas and Greek asteroid groups are currently in a fairly stable situation - swapping the massive Jupiter with Mars may cause ...


6

The conceptual technology you are looking for is called "Star Lifting", and it uses the creation of powerful magnetic fields outside of the star to "squeeze" it and force huge masses of plasma to be ejected. At that point the people doing the "star lifting" can capture the plasma, cool it and extract whatever they are looking for from it, and store the rest ...


4

Jupiter would appear as a much larger object in the sky. Probably as a small bright disc with visible bands of clouds. The Earth might suffer some very slight orbital perturbations. The eccentricity of the Earth’s orbit changes slightly over a time period of 100,000 years, the orbit ranges from being a nearly perfect circle to being an oval and back to a ...


4

My initial guess would be that the Earth, like the Moon, would lose about 2779.84 km of its average diameter, and calculations indicate that it would then have 0.478 x its original volume. My initial guess is more like "this is really hard". In order to remove mass from a body, you need to deliver enough energy to a portion of it to allow it to achieve ...


2

If "the local star" isn't our Sun, I think I can help you. Actually, I think I can even if it is the Sun, but in the far future. In "The End of the Sun", two such scenarios are described. These will occur naturally during the star's lifespan, without the need for any third-party intervention, advanced technology or sorcery. You say "thousands of years", so ...


2

Given that the inner Solar System has been pretty thoroughly cleaned by the swollen red giant phase of the Sun's senescence, there could be no Late Heavy Bombardment to remelt the intial crust that begins to form almost immediately after the engulfment that cause the melting is halted. Whatever primordial crust Earth had predated the Moon-forming event. We ...


2

See Stephen Baxter’s Xeelee series for an example of this in fiction. Dark matter life-forms called photino birds live in the gravity wells of normal baryonic matter stars, but novae and supernovae disrupt their habitats, so they use their technology to stop nuclear fusion in stars and prematurely turn them into white dwarfs. (In real life, there seems to be ...


2

This answer contains two answers, rolled into one. First the Moon, then the Earth. The Moon: The Moon - in short: Lots of green and black crystals, but because of the sun they look a bit bluer than they would on Earth. The Moon - in full: First of all, although I said that the surface "may resemble the darker basalt of the Moon's seas/maria", it won't ...


1

Would something that includes a lot of high technology artifacts be OK for what you want to do? My understanding is that planet formation is a messy process that could result in a roughly earth size & composition planet getting ejected into the deep freeze of interstellar space. Suppose a space faring species that also has CNO fusion reactors, so they ...


1

Okay... it's not a precise answer, but here goes. I'll start by discussing my research into the Moon's solidification, since it's relevant, especially as the Moon took longer to solidify than the Earth originally. (I edited all this into the question as supporting information.) Then I'll go from there to the case of the Earth. According to a 2011 paper, 80% ...


1

The Photino Birds from the Xeelee sequence. Creatures made of dark matter that feed by orbiting through stable gravity fields. They're uneffected by heat or essentially any other normal physical processes. Because they like stable gravity wells, white dwarfs are their ideal environment. They REALLY don't like black holes or neutron stars. They "infect" a ...


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