//
// simple `cosmology calculator'
// can calc commonly used cosmology distances:
//      hubble distance
//      comoving distance
//      transverse comoving distance
//      angular diameter distance
//      luminoisity distance
//      light-travel distance
// in addition, this calculator also calc some other
// useful infomation related with Chandra
//
// Junhua Gu
// LIweitiaNux <liweitianux@gmail.com>
//
// Version 2.0
//
// Last Modified:
//   August 12, 2012
//