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Medieval astronomy was dominated by the writings of Aristotle.  Aristotle divided motion into earthly lines and heavenly circles, so ...

Image credit: Armando Bernui, Braz. J. Phys. vol.35 no.4b, 2006

Image credit: Frank Close, Nature 424, 376-377(24 July 2003). “In any case, the number three fitted perfectly th...

 Chess is Almost Solved  Image credit: © 2013 Masterpiecegift.com. “There are some things we do much better than comput...

  Image credit: NASA / ESA. “When I say, ‘I love you,’ it’s not because I want you or because I can’t have you. It ha...

Hydrogen, Helium, and not much else   Image credit: Frank X. Timmes of http://cococubed.asu.edu/. “I see a lot of new ...

Credit: NASA The Sun The majority of stars in the galaxy, including our Sun, Siriu...

Imagine you were standing in the center of a circle 100 meters in radius.  How long do you think it would take to leave the circle?  U...