A British satellite in space has just "set sail" to return to Earth.
TechDemoSat-1 was launched in 2014 to trial a number of new in-orbit technologies but has now reached the end of its operational life.
To bring it out of the sky faster than would ordinarily be the case, it has deployed a "drag sail".
This large membrane will catch residual air molecules at its altitude of 635km and pull TDS-1 quickly into Earth's atmosphere where it will burn up.
There is a lot of interest currently in "clean space" technologies.
