Florida ? NASA still doesn’t know when it will be able to launch shuttle Atlantis – or when it will be able to send off the four other missions that are scheduled to go to the international space station and the Hubble telescope this year.

In a news conference Thursday, engineers said that Atlantis – whose Dec. 6 launch was scrubbed because of problems with fuel sensors – now won’t launch before Jan. 24, and more likely sometime in February.

That, in turn, will delay the scheduled Valentine’s Day launch of Endeavor to sometime in March at the earliest – and could have a domino effect on the three other launches scheduled for later in the year.