 Precision Array for Probing the Epoch of Reionization

The Donald C. Backer Precision Array for Probing the Epoch of Reionization (PAPER) is a radio interferometer funded by the National Science Foundation to detect 21 cm hydrogen (HI) fluctuations occurring when the first galaxies ionized intergalactic gas at around 500 Million years after the Big Bang.PAPER is a focused experiment aimed toward making the first
statistical detection of the 21 cm reionization
signal.