Published: Apr 20, 2010 11:10 AM EDT

  CAPE CANAVERAL, Fla. (AP) - Bad weather is once again delaying
space shuttle Discovery's trip home.
      Mission Control decided to skip Tuesday morning's first
touchdown opportunity because of rain that developed just before
daybreak near the Florida landing strip. Fog was also a concern.
      Commander Alan Poindexter and his crew were instructed to take
another swing around the world, in hopes the weather would improve.
      If the sky does not clear up at Kennedy Space Center, NASA will
send Discovery and its seven astronauts to the backup landing site
in Southern California. They're wrapping up a 15-day resupply
mission to the International Space Station.
      Monday's landing attempts were thwarted by rain.