A 2-unit Cubesat mission comprising a constellation initially of fifty CubeSats (called QB50) developed commercially in South Africa; nSight-1 carries instruments to study the lower thermosphere. The first twenty-eight satellites were deployed in batches from the International Space Station in 2017 into near-circular orbit at an altitude of about 400 km. The second batch, of eight CubeSats, will be placed in Sun-synchronous orbit at 500 km.