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Home Astronomy

If You are Going to Name Aliens, Use This Quantity

February 22, 2025
in Astronomy
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If You are Going to Name Aliens, Use This Quantity
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Let’s dive into a kind of cosmic curiosities that’s certain to blow your thoughts: how we’d chat with aliens. And no, I’m not speaking about elaborate coded messages or flashy indicators. We’re speaking about one thing extremely elementary—21cm radiation.

When you’re planning on having a dialog throughout the vastness of house, utilizing gentle waves (electromagnetic radiation) is just about your go-to choice. It’s quick, dependable, and, effectively, it’s essentially the most sensible option to shout out to different civilizations within the universe. However why particularly 21 centimeters? That’s the place issues get juicy.

This 21cm radiation isn’t just a few random frequency we picked out of a hat. It’s tied to one thing very important, often known as the hydrogen spin flip. Hydrogen atoms consist of 1 proton and one electron, and these tiny particles have a property known as “spin.” Consider spin like just a little arrow pointing up or down. Now and again, within the huge reaches of house, a hydrogen atom’s electron can flip its spin, going from a state the place its spin is aligned with the proton to at least one pointing in the other way. This flip releases power within the type of radiation at—you guessed it—a wavelength of 21 centimeters.

So, why does this matter? Effectively, any good civilization, whether or not they have blue pores and skin, tentacles, or one thing more odd, will finally uncover hydrogen, perceive spin, dabble in quantum mechanics, and determine this entire 21cm radiation factor. They’ll name it one thing totally different (they gained’t have “21” or “cm”) however the idea stays common. It’s just like the cosmic Rosetta Stone.

What makes 21cm radiation excellent for long-distance interstellar chats is its means to chop by way of interstellar mud. Area is filthy, with mud clouds that block out different types of gentle. Nonetheless, 21cm waves are just like the VIPs of the universe, slipping by way of the velvet ropes of cosmic particles to hold their message far and vast.

Right here’s a enjoyable reality: NASA’s Pioneer spacecraft, launched within the early 1970’s, carry plaques. On these plaques there’s a useful diagram of the hydrogen spin flip transition. All different measurements on the plaque, together with the peak of people, are made in reference to this elementary distance. So the hope is that aliens can acknowledge the hydrogen spin-flip transition and use that to unlock the remainder of our message.

Now think about this situation: At some point, astronomers on Earth detect an uncommon surge of 21cm radiation. It’s not coming from a random hydrogen cloud; it’s directional, purposeful. That would very effectively be an alien civilization sending us a “What’s up?” throughout the cosmos – 21cm radiation makes for an ideal calling card.

Utilizing 21cm radiation to speak with aliens leverages a fundamental, common fixed. And who is aware of? Possibly sooner or later, once we lastly hear that sign, we’ll know that someplace on the market, one other clever species found out the identical galactic hack we did.

So hold your eyes—or somewhat, your telescopes—peeled. The following large discovery could possibly be only a spin flip away!

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