Astronomers tried to confirm a signal from the birth of the first stars after the Big Bang. They saw nothing.
, a leader of the EDGES experiment based at Arizona State University, says further work is needed to settle the issue. “We’re excited to see the results from their early observations,” he wrote in an email, adding that “given the difficulty in making these types of observations, there is a substantial process ahead to assess and integrate this new work into the ongoing investigation.”
The EDGES antenna, left, collected data in remote western Australia. The SARAS antenna, right, floated on a pair of lakes in India.When hydrogen atoms first formed, they absorbed and then emitted ambient 21-centimeter radiation at equal rates, which made the clouds of hydrogen that filled the primordial universe effectively invisible.
But the observed dip, which occurred around a wavelength of 4 meters, was not what theoretical cosmologists had expected: The timing and shape of the trough were off, indicating that the first stars turned on surprisingly early, and that x-rays flooded the universe soon afterward.
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