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It might seem easy to move objects in space, but change in potential and/or kinetic energy to move a moon is enormous. It's easy to imagine that launching an entire moon into orbit would take an unfathomable amount of energy, but it takes a comparable amount of energy to move a moon out of orbit, either back to the planet or to push out out of orbit. ...

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When we visualize a Riemannian manifold from outside, abstractly, as a part of ordinary space but with a different metric, like in the disk model of the hyperbolic plane, we get very nice images, but it looks very different from how it would look to a creature living inside of it. When you are inside, it doesn't look all that distorted, because you, and ...

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Space-time is founded on the idea that mass/energy do not change, but that space, that which contains all things, changes. Consequently the concept of time is reflective of this change in space. In other words, the speed of C is constant, and consequently so is mass. The only thing that is relative is the changing of space and our idea of time. "Seeing" ...

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As you travel through the warped spacetime, you would not notice much difference. This is because any spacetime regions you are likely to ever encounter look exactly the same as flat spacetime locally. This is great news for us because it means we'd always be able to assume that propelling ourselves forward will actually make us go forward and not to the ...

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Here is a table for various situations: The range ( ignoring dark polar crater) from 122C during the two week dat and at 0 latitude, to -158 at night. They probably did not take the cameras out unless within the range. It may be that the constituent parts of the camera would not work outside that range. Between the maxima and the minima there are ranges ...

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My educated guess is that a large block of ice, delivered to space somehow, would last quite a while. If we assume it is in Earth orbit, the side facing the sun would sublimate (go directly from solid to gas) and dissipate. The rate of sublimination would depend on the insolation (power per unit area), which is about 400 $W/m^2$ and the absorption ...

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