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Picking up signals from the early universe is extremely challenging. They are mostly blocked by the Earth’s atmosphere, or drowned out by human-generated radio transmissions. That’s why a team of scientists and engineers have decided to send a small spacecraft to lunar orbit and measure this signal while traversing the far side of the Moon, which is radio-quiet. astronomers are trying to catch energy produced by these hydrogen clouds in the form of radio waves, via the so-called 21-centimeter line.