A new European Space Agency’s space telescope is set to be launched atop a SpaceX Falcon 9 rocket today. The Euclid space telescope will hunt for clues about two of the universe's greatest mysteries…dark matter and dark energy. It will try to reveal how the universe has expanded and how the structure has evolved over the cosmic history. The dark universe is the mysterious part of the universe that we cannot see. It is composed of two main components: dark matter and dark energy. While dark matter makes up about 85% of the matter in the universe, dark energy makes up about 70% of the energy in the universe. It is, in fact, dark matter that holds galaxies together and prevents them from flying apart. Despite making up an estimated 95% of the universe, dark matter and dark energy cannot be detected directly. Instead, scientists observe them in the gravitational warping effects seen in many galaxies across the universe. Scientists say that without dark matter, galaxies would not have been formed. On the other hand, dark energy causes the universe to expand at an accelerating rate.

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