The Hydrogen Line

[Roscoe]

An amateur radio enthusiast picked up a radio transmission on 1420 Mhz, a frequency called the hydrogen line. He speculated that it may have been an alien race attempting to communicate.

When you zap hydrogen you give it energy and that is the frequency it emits. 

Hydrogen accounts for 73% of all the matter in the universe. Scientists can energise hydrogen atoms to make them move and when they move they give off a frequency that can travel vast distances through space. The scientists believe that alien races might use this particular frequency because it is one of the most abundant emitters of radio waves in the universe. so if anyone was looking they might expect to find signals exactly on the hydrogen line.

So like the radio ham you might like to listen on 1420 Mhz and you never know what you might hear.

[zqwerty]

The Fermi Paradox Revisited: Technosignatures and the Contact Era

https://iopscience.iop.org/article/10.38...357/ac9e00

"A new solution to the Fermi Paradox is presented: probes or visits from putative alien civilizations have a very low probability until a civilization reaches a certain age (called the "Contact Era") after the onset of radio communications. If biotic planets are common, putative advanced civilizations may send probes not to any planet showing biosignatures, but rather to planets with technosignatures, such as radio broadcasts."

[Oh_hunnihunni]

Or if they are sensible, those are exactly the ones to be avoided.

[Lilith7]

Or if they are sensible, those are exactly the ones to be avoided.

Which does seem the more likely decision - if they have any sense...

[nzoomed]

I dont know much about the hydrogen line, buy there have been recently signals discovered from other star systems.

Check out the angry astronauts youtube channel, he had just done a video about it.

[Oh_hunnihunni]

The space beyond our tiny bit of dust is so big, so impossibly strange, that our knowledge of what goes on out there is even smaller that our knowledge of our own oceans.

No wonder there are signals we can receive. But understand them? Know what they are?

I don't think so.