sentences:  Gliese 581d
  
  Gliese 581d (often shortened to Gl 581d or GJ 581d) is an extrasolar planet orbiting within the Gliese 581 system, approximately 20.4 light-years away in the Libra constellation.It is the third planet claimed in the system and (assuming a six-planet model) the fifth in order from the star.