What are years... and the galactic supermassive black hole!
It's leap year time... so what are years, anyway? And what do they have to do with the supermassive black hole in the core of the milky way? Mr. Grey, of course: http://www.youtube.com/cgpgrey...
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With all the talk these days about "leaping years," we should probably be asking "whatis a year, anyway?" Ignoring all cultural history, a year is basically the period oftime that it takes for one physical body to orbit another. So an earth month could equallybe called a "moon year."But to under-simplify things, even if we stay on earth, there are several different waysto define a year — either the time it takes for the tiltof the earth's axis to come back to the same angle relative to the sun (called a tropicalyear) — or the amount of time before we come backand see the same stars rising behind the sun (called a sidereal year - pronounced likeethereal) — or, since the earth follows an ellipticalorbi...
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With all the talk these days about "leaping years," we should probably be asking "whatis a year, anyway?" Ignoring all cultural history, a year is basically the period oftime that it takes for one physical body to orbit another. So an earth month could equallybe called a "moon year."But to under-simplify things, even if we stay on earth, there are several different waysto define a year — either the time it takes for the tiltof the earth's axis to come back to the same angle relative to the sun (called a tropicalyear) — or the amount of time before we come backand see the same stars rising behind the sun (called a sidereal year - pronounced likeethereal) — or, since the earth follows an ellipticalorbi...
