Space is really, really big, and aliens are not magic. In my previous article, I introduced these two points as being critical for anyone inclined to believe that UFOs are spacecraft from a distant star system. (I am not so inclined.) They are also the most important points to consider if you want humanity to get out of the solar system. (I do.)
Last week, we covered the first point about the distances between the stars. This week, we are going after the second point, which forces us to deal with the physics problems involved in crossing those vast distances even if we do not know yet what their solution might be.
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