Cosmic Vision is the third campaign of space science and space exploration missions in the Science Programme of the European Space Agency (ESA). Formulated in 2005 as Cosmic Vision: Space Science for Europe 2015–2025, the campaign succeeded the Horizon 2000 Plus campaign and envisioned a number of missions in the fields of astronomy and solar system exploration beyond 2015. Ten missions across four funding categories are planned to be launched under Cosmic Vision, with the first being CHEOPS in December 2019. A mission to the Galilean moons (JUICE), the first deep space mission with an opportunistic target (Comet Interceptor), and one of the first gravitational-wave space observatories (LISA), are planned for launch as part of the Cosmic Vision campaign. The initial call of ideas and concepts was launched in 2004 with a subsequent workshop held in Paris to define more fully the themes of the Vision under the broader headings of Astronomy and Astrophysics, Solar System Exploration and Fundamental Physics. By early 2006, the formulation for a 10-year plan based around 4 key questions emerged: What are the conditions for planet formation and the emergence of life? How does the Solar System work? What are the fundamental physical laws of the Universe? How did the Universe originate and what is it made of? In March 2007, a call for mission ideas was formally released, which yielded in 19 astrophysics, 12 fundamental physics and 19 Solar System mission proposals. In March 2012, ESA announced it had begun working on a series of small class (S-class) science missions. The first winning S-class concept is set to receive 50 million euros (£42m) and will be readied for launch in 2017. Small class missions (S-class) are intended to have a cost to ESA not exceeding 50 million euros. A first call for mission proposals was issued in March 2012. Approximately 70 letters of Intent were received. In October 2012 the first S-class mission was selected. The current list of S-class missions include the following: S1, CHEOPS, to measure known exoplanets' size by photometry; launched on 18 December 2019.