A huge NASA balloon, similar in size to Dunedin's Forsyth Barr Stadium, will launch in Wanaka later this month.

It's hoped the heavy-lift, super-pressure balloon will be launched on Sunday week.

The balloon is an valuable low-cost tool,  offering scientists the ability to test instruments being considered for use in spacecrafts.

Chief of NASA's balloon programme, Debbie Fairbrother says missions like this expand the envelope for science and research.

NASA's hoping this balloon will stay aloft for a 100 days, double the current record of 54.