NASA are preparing for the first US astronaut launch in almost a decade - days after take-off had to be aborted due to bad weather.
Two of them were set to blast-off from Florida on Wednesday night - but the team decided to postpone the mission 17 minutes beforehand.
NASA have been working with Elon Musk's company SpaceX on the launch.
But Dublin-based technology company Skytek's also providing software that instructs astronauts on their tasks in space.
Founder, Sarah Bourke, says it's an exciting time.
She said: "For an Irish company to be involved in such an important event obviously you feel very proud of all the work that Skytek staff have done.
It's a great day for The International Space Station, for NASA and for ourselves being a partner in this project."
The launch is scheduled for 8:22pm Irish time.
