Luminosity N/A Planets Moons 0 Asteroid Belts 0 Asteroids 0 Objects 0 Location: Milky Way / Armstrong Nebula / Grissom Grissom is a small system with three , one and two asteroid . It may be named for Virgil 'Gus' Grissom, the second American into space and one of the first American astronauts to have died in the line of duty (Apollo 1). Prerequisite: UNC: Geth Incursions (Mass Effect)