On March 13, 2023, Pale Blue conducted a test of  it's water vapor propulsion system in low Earth orbit. Pale Blue is a start-up company from the University of Tokyo, founded in 2020.  

The propulsion system was installed on 'EYE' a nano-satellite for the Star Sphere project. The Star Sphere project is led by the Sony Group Corporation with the objective of inaugurating a space photography service in 2023. The satellite will employ Pale Blue's propulsion system to enter the target orbit. 

"Pale Blue successfully developed and operated its water-based thruster, and with this, the company takes a huge step towards orbit insertion for STAR SPHERE Project," said Jun Asakawa, CEO and Co-Founder of Pale Blue.