Whatever the outcome, and the science returned, there will always be questions about the costs of such missions and whether they can be justified in the current financial climate.
On Twitter, Dr Taylor responded to just such a question by borrowing a catchphrase from the irascible BA Baracus character played by Mr T in the A-Team television show: "I pity the fool."
Thomas Reiter, director of human spaceflight and operations at Esa, acknowledged how the top line figure of 1.4bn euros appeared.
But he explained: "If you divide it by the 20 years that the development and the mission has cost, it's about cents per European citizen per year that was contributing to this new knowledge."
On Twitter, Dr Taylor responded to just such a question by borrowing a catchphrase from the irascible BA Baracus character played by Mr T in the A-Team television show: "I pity the fool."
Thomas Reiter, director of human spaceflight and operations at Esa, acknowledged how the top line figure of 1.4bn euros appeared.
But he explained: "If you divide it by the 20 years that the development and the mission has cost, it's about cents per European citizen per year that was contributing to this new knowledge."