Cosmic Vision (also known as Cosmic Vision 2015–2025) is an European Space Agency (ESA) long-term space science missions programme spanning between years 2015 and 2025, a successor to the Horizon 2000 programme.
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 has began working on a series of small science missions. The first winning "S Class" idea is set to receive 50 million euros (£42m) and will be readied for launch in 2017.
Large missions (L)
Originally it was intended that L-class projects were to be carried out in collaboration with other partners and should have an ESA cost not exceeding 900 million euros. However, in April 2011 it became clear that budget pressures in the US meant that an expected collaboration with NASA on the L1 mission would not be practical; so the down-selection was delayed and the missions re-scoped on the assumption of ESA lead with some limited international participation.
Two large missions has been selected:
- L1, JUICE (Jupiter Icy Moon Explorer), a selected mission to the Jupiter system (with heritage from Laplace); launch planned for 2022.
- L2, ATHENA (Advanced Telescope for High Energy Astrophysics), an X-ray observatory with a launch planned for 2028. 
- L3 mission is still to be announced. It's launch is planned for 2034. Though originally planned to be announced along with L2 mission - no such announcement was made as of August 2014. 
Medium-size missions (M)
M-class projects will usually be relatively stand-alone ESA projects. The two first M-class missions, M1 and M2, were selected in October 2011:
- M1, Solar Orbiter, an adopted mission for close-up observations of the sun; launch planned in 2017.
- M2, Euclid, a selected mission to study dark energy and dark matter; launch planned for 2020.
- M3, PLATO, a selected mission to search for exoplanets and measure stellar oscillations; launch planned for 2024.
- M4 is still to be announced. It's launch is planned for 2025 and ESA announced a call for missions in August 2014 with a deadline of 15 January 2015. Selected mission will be announced in March 2015.
Small missions (S)
S-class missions 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:
Missions of Opportunity
Occasionally ESA makes contributions to space missions led by another space agency. There is currently one candidate for such a mission of opportunity within Cosmic Vision:
- "ESA's 'Cosmic Vision'". ESA. 19 February 2014. Retrieved 25 August 2014.
- "Esa to start mini space mission series". BBC. 12 March 2012. Retrieved 20 February 2014.
- "New approach for L-class mission candidates". ESA. 19 April 2011. Retrieved 20 February 2014.
- "JUICE is Europe's next large science mission". ESA. 2 May 2012. Retrieved 23 August 2014.
- "ESA Science & Technology: Athena to study the hot and energetic Universe". ESA. 27 June 2014. Retrieved 23 August 2014.
- "Call for White Papers for the definition of the L2 and L3 missions in the ESA Science Programme". ESA. 5 March 2013. Retrieved 23 August 2014.
- "Dark and bright: ESA chooses next two science missions". ESA. 4 October 2011. Retrieved 23 August 2014.
- "Mission status". ESA. 28 November 2013. Retrieved 20 February 2014.
- "ESA selects planet-hunting PLATO mission". ESA. 19 February 2014. Retrieved 20 February 2014.
- COSMIC VISION M3
- "Call for a Medium-size mission opportunity in ESA's Science Programme for a launch in 2025 (M4)". ESA. 19 August 2014. Retrieved 23 August 2014.
- "Call for a small mission opportunity in ESA's science programme for a launch in 2017". ESA. 9 March 2012. Retrieved 20 February 2014.
- "S-class mission letters of intent". ESA. 16 April 2012. Retrieved 20 February 2014.
- "ESA Science Programme’s new small satellite will study super-Earths". ESA. 19 October 2012. Retrieved 20 February 2014.
- "SPICA - A space infrared telescope for cosmology and astrophysics". ESA. 19 February 2014. Retrieved 20 February 2014.