It's a big week for space enthusiasts and pop fans, as an all-female crew gears up for the Blue Origin NS-31 launch set to take place in a matter of hours.

Katy Perry and TV host Gayle King will join four others on the first all-women expedition in 60 years - rocketing 100 kilometres above Earth tomorrow.

They'll cross the internationally recognised space boundary - and float for four minutes.

It's part of a mission to balance out the 90 percent of men dominating space expeditions.

Asia Pacific Aerospace Consultants CEO Kirby Ikin says most of this crew have paid for the experience.

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