Μακάρι να κόστιζε ένα εκατομμύριο.Αντιγράφω από την ιστοσελίδα της ESA:"What is the total cost of the mission? How does the final cost compare to the initial cost forecast?The total cost of the mission, from the beginning of preliminary studies to the end of operations, is 740 M€. This does not include expenditures related to the DPAC consortium, which are covered by the member states participating in the consortium, not ESA. These costs are currently estimated at around 200 M€. The price tag for the spacecraft itself is 450 M€. This is lower than the forecast at the very beginning, which was based on a larger spacecraft that would have been launched with an Ariane 5 rocket. Compared to estimates determined at the start of the industrial phase, mission cost will exceed the original forecast by 16%."[ http://www.esa.int/Our_Activities/Space_Science/Gaia/Frequently_Asked_Questions_about_Gaia ]