Nasa delays landing of Discovery

The astronauts had powered up their spacecraft and were awaiting word from Mission Control to fire their braking rockets and head for home when controllers announced early Monday that low clouds over Cape Canaveral would postpone the landing.

"We've been working this pretty hard as I'm sure you can imagine from our silence down here," Mission Control radioed Discovery commander Eileen Collins. "We just can't get comfortable with the stability of the situation for this particular opportunity so we are going to officially wave you off for 24 hours."