Eculid: The Dark Explorer Telescope: Facts About The Euclid, Its Construction, Launch, Mission And The Enigma of Dark Energy and Dark Matter , Rameriz, Robert C. -

What is the universe made of? This is one of the most fundamental questions in science, and one that has puzzled physicists and astronomers for centuries.

In recent years, however, new evidence has emerged that suggests that the universe is not made up of just the matter that we can see, but also of two mysterious substances known as dark matter and dark energy.