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  • 8 years ago
The Planet That Wasn't.  By Isaac Asimov

The Planet That Wasn't. By Isaac Asimov

My Comments/Review Of; The Planet That Wasn't - By Isaac Asimov - "In 1909, the American astronomer William Wallace Campbell went further, and stated categorically that there was nothing inside Mercury's orbit that was brighter than the eighth magnitude. That meant that nothing was there that was larger than forty-eight kilometers in diameter. It would take a million bodies of that size to account for the movement of Mercury's perihelion(2). With that, hope for the existence of Vulcan flickered nearly to extinction. Yet Mercury's perihelion did move. If Newton's law of gravitation was correct there had to be some sort of gravitational pull from inside Mercury's orbit. And, of course, there was, but it originated in a totally different way from that which anyone had imagined. In 1915, Albeit Einstein explained the matter in his General Theory of Relativity. Einstein's view of gravitation was an extension of Newton's--one that simplified itself to the Newtonian version under most conditi