claim: The Selma to Montgomery marches were part of a broader voting rights movement underway in Selma and they were a significant event of the 20th century.
evidence: SPT-100 is a Hall-effect ion thruster , part of the SPT-family of thrusters .. Hall-effect. Hall-effect thruster. ion thruster. ion thruster. SPT stands for Stationary Plasma Thruster .. It creates a stream of electrically charged xenon ions accelerated by an electric field and confined by a magnetic field .. xenon. xenon. Thruster is manufactured by Russian OKB Fakel , and was first launched onboard Gals-1 satellite in 1994 .. OKB Fakel. OKB Fakel. Gals-1. Gals ( satellite ). In 2003 Fakel debuted a second generation of the thruster , called SPT-100B , and in 2011 it presented further upgrades in SPT-100M prototypes .. As of 2011 SPT-100 thrusters were used in 18 Russian and 14 foreign spacecrafts , including IPSTAR-II , Telstar-8 and Ekspress A and AM constellations .. IPSTAR-II. Thaicom 8. Telstar-8. Galaxy 28. Ekspress. Ekspress