Cooling Issue News Today

the missions ambitious agenda remains landing the first woman and first person of color on the moon. this by 2025. also going further afield, ultimately getting humans to land on the surface of mars. but before we get there, "artemis 1" will need to fly around the moon using the most powerful rocket to launch since "saturn 5" took astronauts to the moon for the last time back in 1972. space and defense correspondent kristin fisher is live from kennedy space center. you are ready to see...

"For the second time in 15 days an AC local train has departed the station with doors open. No AC and Ventilation in the train. No one attending complaints by passengers," tweeted a passenger.

Orbiting international space station. >> failure of an internal flow control valve. >> reporter: to american astronauts are venturing out. their mission? to replace a pump needed to cool the vessel. >> i dont know if you guys believe in miracles, but i got the hitch pin on the first try. >> thats awesome, rick. >> reporter: offer the weekend, astronauts rick mastacchio and mike hop kins, cooling fluid, ammonia. >> hooking up the big heavy ammonia lines are massive. if you were to leak ammonia, n...

>> over the weekend, astronauts rick mastracchio and michael hopkins removed the faulty cooling pump, which is the size of a refrigerator. any now must install the new one. their task is a delicate one. the equipment contains a knoxious cooling fluid, ammonia. >> some of the danger is hooking up the big heavy an money yag lines, theyre thick and massive. hooking those up if you were to leak ammonia, its not a pleasant chemical. you couldnt bring it inside. theres definite risks out there. >> mas...

Mastracchios space suit which had a cooling issue. nasa says he was never in any danger. now saturdays spacewalk lasted more than five hours. it was billed as a success so far. this spacewalk has been going on for more than four hours. the hope is that they will be able to wrap things up and go back inside the international space station very soon and by the way, this is the second time ever there has been a spacewalk on christmas eve, the first one happened 14 years ago. >> thanks so much. cert...

About 30 minutes they could no longer see anymore flames. obviously theres a cooling issue there. what are the risks and what needs to be done urgently? >> the urgent thing is you have to keep water going into that nuclear fuel pool. its not being cooled. they are just pumping salt water in and its boiling off. almost like a pot on the stove. it will keep boiling off. you have to make up for whats boiling off. if the water drops and fuel becomes exposed, it causes a very high gamma ray exposure ...

The japanese have demonstrated a great resiliency and ability to pull together in times of adversity. we are confident theyll overcome this challenge. >> the problems in japan of course led to questions about the safety of u.s. nuclear plants. there are 104 of them, some of which are on fault lines or near them, and some of them would be vulnerable to tsunamis. but officials at the white house briefing today said that all those things were taken into account when designing those plants and drawi...

Comfort some people who are feeling that anxiety? >> well my goal from the outset has been to point people towards verifiable information, to explain the technology and to give some context to the information and to answer basic questions. a lot of people asking, im sorry this is a stupid question. there is no stupid question. this is an unfamiliar technology for most people. as engineers, we owe it to society to engage and explain this technology to people in a way that they can understand. >> ...