Accion Systems is a Boston-based startup that designs and manufactures advanced propulsion systems for satellites and spacecraft. The company was founded in 2014 by two MIT engineers, Natalya Bailey and Louis Perna, and has since raised over $40 million in funding. Accion's propulsion systems use a proprietary technology called electrospray thrusters, which are smaller, lighter, and more efficient than traditional chemical thrusters. The company's customers include NASA, the US Air Force, and several commercial satellite operators.