It is the most expensive and the largest spacecraft ever to be put into orbit - measuring about the same size as Croke Park.

The space station - which has a crew of 6 astronauts on board - will be visible tonight, tomorrow and on Thursday - and will not be seen again until later this year.

Chairman of Astronomy Ireland - David Moore said that spotting the spacecraft is all about timing:

"Unless you are out at the right time you won't have noticed it before but if you go out at the right time then you can't mistake it I watched it a couple of nights ago and it was a hundred times brighter than the brightest star in the sky", he said

"If you see any star in the sky you'll easily see the international space station, it's that bright"

The rest is here:

International Space Station visible in Irish sky tonight