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 …

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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 …