Katy Perry prepares for spaceflight

After a long day of rehearsing for her upcoming world tour, Katy Perry decided to peruse a few books to help her unwind before bed.

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“I was listening to ‘Cosmos’ by Carl Sagan and reading a book on string theory,” she recalled. “I’ve always been interested in astrophysics and interested in astronomy and astrology and the stars. We are all made of star-dust and we all come from the stars.”

But the pop superstar was moti-vated by more than just curiosity. On Monday, she will join Jeff Bezos’ fiancee Lauren Sanchez, journalist Gayle King, and three other women on an all-female Blue Origin spaceflight.

Perry spoke with The Associated Press at her Southern California re-hearsal space on Wednesday, days before she was set to leave for train-ing in Texas.

“I am talking to myself every day and going, ‘You’re brave, you’re bold, you are doing this for the next gen-eration to inspire so many different people but especially young girls to go, “I’ll go to space in the future.” No limitations,’” she said.

Perry said she has been “psycho-logically” preparing for the space-flight by reading work from the late Sagan and other scientists.