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Unfortunately, your question has no answer. Both have errors. Both can be unreliable. Your choice really depends on how you plan on using them. Satellites instrument contain sources of error, such as bad observations (wildfires in the NIR), mapping problems (especially near the poles), and representation error. Don't underestimate those sources of error- ...


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The Martian nightglow comes from molecules in the atmosphere that react with solar radiation, carry it over to the night side, and give off the energy they gained as ultraviolet light as they free-form stable compounds. From https://www.nasa.gov/press-release/goddard/2020/mars-nightglow: The diagram explains the cause of Mars’ glowing nightside atmosphere. ...


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These are not pure satellite images. On the images shown in the question, one can see bathymetry in the oceans that cannot be seen from a satellite image. Rather, those images use a static image background (the land may be from a satellite mosaic, but not the ocean) along with a calculated cloud mask, then show the satellite image only where there are ...


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The second part of the question is easy to answer - given that the Arctic has been ice free in relatively recent geological history, e.g. in the Mesozoic, and it is expected to be ice free in summer within a few decades as a result of global warming, positing a habitable planet where polar oceans are navigable, at least in summer seems fairly safe.


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This is a placeholder answer in anticipation of (1) the question being closed before I can write a valid answer, and (2) I will replace this placeholder with a valid answer. I have now partially filled in the placeholder, but what I wrote obviously still needs references. The hope is that precision agriculture will be the basis for the next Green ...


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