The European Space Agency's EUCLID mission will map up to 2 billion galaxies that occupy one third of the sky - and try to figure out how much Dark Matter lies between us and them, as well as how Dark Energy is affecting the expansion of the universe. 

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Going back to the Big Bang

RAZOR's Neil Cairns speaks to ESA research fellow Guadalupe Canas-Herrera about the huge challenges facing the EUCLID mission and how it might uncover even more deep secrets of the cosmos.

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