The launch of the new space telescope will be delayed for at least one more day due to high winds, with the launch now scheduled for Saturday, Christmas Day.
The latest delay was announced Tuesday. A rocket could be damaged or even destroyed by high-level wind.
A European Ariane rocket will launch the James Webb space telescope from French Guiana on South America's northeastern coast. The managers will assess the weather on Wednesday.
Since 1990, the Hubble space telescope has been the successor to the $10 billion observatory.
The rocket and telescope were in good shape and only an intermittent communication relay between the two kept the problem from being more serious.
A four-day slip was caused by the issue earlier, and a two-day delay was caused by the problem at the launch site.
After years of delays and cost overruns, the biggest and most powerful science observatory ever built for space is in trouble.
The European and Canadian space agencies are working with Nasa.
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