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Stories about: knots

'Light Knots' Created in the Lab One of the things most people know about light is that it tends to travel in a straight line. This is made obvious by the fact that when you place your hand between a source of light and your face, you no longer see the light. If photons were to be traveling in a chaotic manner, without a sense of direction, then we ... 18 January 2010 02:11 GMT Helix Nebula Reveals Impressive Firework Display The Helix Nebula, or NGC 7293, is undoubtedly one of the most beautiful formations in the known Universe. Shaped like a blue eye, it has been compared by many to the Supreme Being, staring down at its creation. It's the result, like many planetary nebulas similar to it, of low-mass stars such as our Sun dying at... 6 July 2009 03:51 GMT