http://www.weiqigao.com/blog/tags/astronomy/ Sharing My Experience... en Weiqi Gao Fri, 11 May 2012 12:48:36 GMT Pebble (http://pebble.sourceforge.net) http://backend.userland.com/rss http://pebble.sourceforge.net/common/images/powered-by-pebble.gif http://www.weiqigao.com/blog/ http://www.weiqigao.com/blog/2003/08/27/closest_in_50_000_years.html <p>Every news outlet is reporting that Mars is closest to Earth in 50,000 years.</p> <p>But who did the calculation? Anybody whom we know?</p> <p>When was the calculation made? Did Caesar know this? Did Galileo know? Did Newton know? Did Halley?</p> <p>How much closer was Mars 50,000 years ago than today?</p> <p>How close will the two planet ever get? When will that happen?</p> http://www.weiqigao.com/blog/2003/08/27/closest_in_50_000_years.html#comments http://www.weiqigao.com/blog/2003/08/27/closest_in_50_000_years.html Wed, 27 Aug 2003 12:57:09 GMT