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Flow of liquid hydrogen to the rockets -- that core stage, the orange part of the rocket. this is according to the nasa broadcast. so apparently there has been some kind of leak that has been detected. we are keeping an eye on that, but look, there is still a backup opportunity on monday or tuesday. >> yeah. so let's go now to kennedy space center and cnn's space and defense correspondent kristin fisher life there for us this morning. kristin, a bit of a delay again. but it's possible it could only be a minor one that it would only stall them a half hour. what are you hearing on the ground the...

The liquid hydrogen, very cold, negative 420 degrees fahrenheit. so the seal is where the problem is. and so they're trying to make that seal warmer and then colder again to kind of thermally shock it back into sealing. but again, they've tried this once before and it didn't work. now they're trying it for a second time. but, you know, boris and amara, or -- i'm sorry, the times are getting confusing now, it's sara now. the big question now, sara, is there enough time left on the countdown clock to make up for all this time that they've spent troubleshooting. it just doesn't look like there is...

Back to the moon before eventually heading to mars. nbc's jake ward is at the kennedy space center in florida, where preparations are underway. jake, has a looking for a launch today. >> well katie, as you mentioned, the issue on monday was a bad engine center. at that time, it was all about putting the fuel in the rocket inside. basically huge tank of liquid hydrogen sits below huge tank of liquid oxygen, at this hour, crews are working to put those two chemicals inside but the difficulty is, how incredibly delicate that is, and you have to hold oxygen negative 200 something degrees, they get...

About. the one on monday but they were worried about was, yes they had a leak that they got sorted, but then they had another issue in which they thought one of the four engines was not cooling properly. it turns out that that actually was cooling properly. they had a faulty sensor. just to step back and realize, how extraordinary complicated it is to get one of these things off the ground. and the incredible caution and complexity of the checks list that goes into it. there's 500 variables that have to all be checked green before they go forward with this. that's why we are looking in this ca...

Going to be going up and it will be extremely loud. been watching this stuff ever. since the space landing of '69. all eyes will be on this rocket to see if it really can get off the ground today. yes, well, that is the issue, and overnight, the team has been dealing with multiple technical problems. first of all, the weather, there was lightning in the area, that delayed fuelling. then a hydrogen leak wasn't spotted. after that, just a few hours ago, we heard about a possible crack in one of the connectors. that doesn't seem to be a problem now. but one of the four huge engines at the bottom ...