The three-body problem

The publication of the novel "The three body problem" written by Chinese author Cixin Liu rekindled my interest about this long-standing issue in classical dynamics. As also pointed out in the novel, an empty space is stationary (and boring). An empty space plus a spherical body is also stationary (still boring). An empty space plus … Continue reading The three-body problem

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The Dark Matter is Out There

In the last 10 years evidence piled up that the largest part of the Universe is not made by ordinary (baryonic)¬†matter. Atoms and neutrinos account to about 5%, while the remaining fraction is partly due to another form of mass that does not interact electromagnetically, called Dark Matter (25%). There are indications that it is … Continue reading The Dark Matter is Out There