Hydrogen · Faith
The frequency of silence and prayer
A radio telescope doesn't speak: it listens, and the longer it listens, the more it hears. What 1420 MHz astronomy teaches about silence and prayer.
A radio telescope is, above all, an ear.
It sends nothing to the sky. It stays still, open, turned toward one point, gathering what arrives. In the hydrogen band, it couldn't be any other way: there, all emissions are prohibited, and the only thing allowed is to listen.
There's something in this instrument that religious people of many traditions would recognize at once.
How a faint signal is heard
The hydrogen signal arriving from the galaxy's clouds is much fainter than the hiss of the instrument itself. The receiver has noise, the electronics heat up, the sky has its background murmur. If you switched the receiver on for one second and looked, you'd see only noise.
What radio astronomers do, then, is wait. Noise is random: now it rises, now it falls, and over time it tends to cancel out. The true signal, even if faint, is always in the same place and keeps adding up. The longer one listens, the more the signal stands out from the noise.
Engineers write this in a formula called the radiometer equation: the uncertainty of the measurement decreases with the square root of the observation time. In simple words, to see a signal twice as faint, you need to listen four times as long.
That's how Harold Ewen picked up the hydrogen line in 1951, with a horn fixed to the window of a laboratory at Harvard. That's how Frank Drake spent about 200 hours listening to two stars in Project Ozma, in 1960. And that's how, to this day, the universe's hydrogen is mapped: with patience measured in hours, nights and years.
Silence in the traditions
In many spiritual traditions, silence is a form of prayer. In the Bible, there's a verse many people know by heart. In the King James Version:
"Be still, and know that I am God." (Psalm 46:10)
Other religions have their own practices of silence, of recollection, of listening. And those with no religion at all also know the value of keeping quiet: to think, to rest, to hear what the noise of the day drowns out.
Sources: NRAO, Essential Radio Astronomy, radiometers · NRAO, Ewen and Purcell's horn · Sky & Telescope, Project Ozma · Psalm 46:10, Almeida Corrigida Fiel (Portuguese)
In Bairo's view
For Bairo, 1420 MHz is the frequency of silence: the band the whole world agreed to leave quiet, where one only listens. In his faith, it's there, in that pure and clean silence, that one can find one's God. It's a spiritual image, not a claim of physics, and he carries it as a symbol. No one transmits on 1420 MHz, not even him.
The radio telescope gives shape to that image. To pray, in Bairo's reading, is more like listening than speaking. He tells, in the chapter The voice he follows, that he walks like a blind man following a voice he trusts. A voice like that can't be heard in the middle of shouting. It's heard the way astronomers hear hydrogen: still, open, for long enough that what is essential stands out from the noise.
And there's patience. The six months he spent at home, building what he didn't know how to build, told in The frequency of silence, were, for him, also a time of listening. The signal didn't appear on the first day.
For you
If your prayer, or your reflection, seems to be going nowhere, radio astronomy has one piece of good news and one demanding one.
The good one: the fact that you only hear noise now doesn't mean there's no signal. It means it's still early.
The demanding one: the signal doesn't stand out by itself. It needs listening time, and protection from interference. Turn off your phone for half an hour. Walk without headphones. Sit in silence before a hard decision. For those who believe, pray without hurrying to speak. For those who don't, simply be quiet and pay attention.
Don't expect to hear something extraordinary the first time. In Project Ozma, the strong signal that excited the team in the first days was only human interference. What the radio telescope teaches is the faithfulness of coming back to listen the next day.
The world protected the hydrogen band so it could keep listening to the universe. You can protect a few minutes of your day to listen to your own life.