New in-space propulsion techniques seem to be popping out of the woodwork. The level of innovation behind moving things around in space is astounding, and now a company from Japan has just hit a significant milestone. Pale Blue, which I assumed was named as a nod to a beloved Carl Sagan book, recently successfully tested their in-orbit water-based propulsion system, adding yet another safe, affordable propulsion system to satellite designers' repertoires.

Using water to jet around space might seem relatively simplistic. However, despite its simplicity and relatively low cost, water jets for satellitepropulsion systems have not yet been widely adopted. This first Pale Blue system, which launched with Sony's EYE satellite as part of its STAR SPHERE program to take pictures of the Earth, was the first time the company successfully tested its system in space.

They did so by operating it for approximately two minutes in early March and adjusting the EYE satellite's orbit in LEO.