We've been broadcasting into space for over a century
The moment humanity invented radio, we started broadcasting into space — unintentionally. Every radio transmission sent from Earth radiates outward in all directions. Television broadcasts, military radar, FM radio, cellular signals — all of it leaks into space at the speed of light.
The first radio signals from Earth were transmitted in the 1890s. That means the earliest human radio signals have now traveled over 130 light-years — creating a vast, expanding sphere of electromagnetic evidence of our civilization. Any sufficiently advanced civilization within 130 light-years of Earth, with sensitive enough receivers, could potentially detect the signature of our broadcasts.
In 2026, if you're reading this, the radio equivalent of early 20th century Earth — Marconi's first transatlantic transmission, the first broadcast of human speech — is already 130 light-years out. Traveling at the speed of light. Forever.
The first radio signals from Earth were transmitted in the 1890s. That means the earliest human radio signals have now traveled over 130 light-years — creating a vast, expanding sphere of electromagnetic evidence of our civilization. Any sufficiently advanced civilization within 130 light-years of Earth, with sensitive enough receivers, could potentially detect the signature of our broadcasts.
In 2026, if you're reading this, the radio equivalent of early 20th century Earth — Marconi's first transatlantic transmission, the first broadcast of human speech — is already 130 light-years out. Traveling at the speed of light. Forever.
Intentional broadcasts: the history of deliberate space messages
While our unintentional leakage has been ongoing for over a century, humanity has also sent deliberate, high-power messages specifically aimed at the stars:
Arecibo Message (1974) — On November 16, 1974, the Arecibo Observatory in Puerto Rico transmitted a 1,679-bit binary message toward the globular star cluster M13, 25,000 light-years away. Composed by Frank Drake and Carl Sagan, it encoded information about our number system, chemistry, biology, and solar system. It was primarily a demonstration of technology and a symbolic gesture — a message in a bottle, thrown into the cosmos.
Cosmic Call (1999, 2003) — Two transmissions from the Evpatoria Deep Space Center in Ukraine, aimed at several nearby Sun-like stars. The first targeted four stars within 70 light-years. The second targeted five more. These were the first messages specifically designed for potential alien intelligence — encoding scientific and mathematical concepts intended to be decodable by an unknown civilization.
A Message from Earth (2008) — Transmitted by the RT-70 radio telescope at Evpatoria toward the exoplanet Gliese 581c (20 light-years away), this message contained 501 messages from the public — the first crowdsourced interstellar transmission. Sound familiar?
Cosmic Echo (2026) — Thousands of individual personal messages from ordinary people, transmitted as real radio signals at 1420 MHz from Station 1. Not a committee's idea of what aliens should hear — the unfiltered voices of thousands of humans who had something to say.
Arecibo Message (1974) — On November 16, 1974, the Arecibo Observatory in Puerto Rico transmitted a 1,679-bit binary message toward the globular star cluster M13, 25,000 light-years away. Composed by Frank Drake and Carl Sagan, it encoded information about our number system, chemistry, biology, and solar system. It was primarily a demonstration of technology and a symbolic gesture — a message in a bottle, thrown into the cosmos.
Cosmic Call (1999, 2003) — Two transmissions from the Evpatoria Deep Space Center in Ukraine, aimed at several nearby Sun-like stars. The first targeted four stars within 70 light-years. The second targeted five more. These were the first messages specifically designed for potential alien intelligence — encoding scientific and mathematical concepts intended to be decodable by an unknown civilization.
A Message from Earth (2008) — Transmitted by the RT-70 radio telescope at Evpatoria toward the exoplanet Gliese 581c (20 light-years away), this message contained 501 messages from the public — the first crowdsourced interstellar transmission. Sound familiar?
Cosmic Echo (2026) — Thousands of individual personal messages from ordinary people, transmitted as real radio signals at 1420 MHz from Station 1. Not a committee's idea of what aliens should hear — the unfiltered voices of thousands of humans who had something to say.
The technology: how radio messages are broadcast to space
Broadcasting a message to space requires three things: a transmitter, a directional antenna, and the right frequency.
The transmitter generates the radio signal. The message is encoded (in Cosmic Echo's case, binary — converting your text into sequences of 0s and 1s), then modulated onto a carrier wave at the chosen frequency.
The antenna focuses the signal in a specific direction. A parabolic dish antenna (like the Arecibo dish, or like Station 1) collects and focuses radio waves — either receiving them from space or transmitting them toward a specific set of celestial coordinates. The parabolic shape ensures the signal is concentrated in a beam rather than radiating in all directions, significantly increasing effective range.
The frequency determines how the signal propagates and who might detect it. At 1420 MHz — the hydrogen line — the signal occupies the frequency most universally associated with interstellar communication.
Once transmitted, the signal is beyond anyone's control. It travels at light speed, outward, indefinitely.
The transmitter generates the radio signal. The message is encoded (in Cosmic Echo's case, binary — converting your text into sequences of 0s and 1s), then modulated onto a carrier wave at the chosen frequency.
The antenna focuses the signal in a specific direction. A parabolic dish antenna (like the Arecibo dish, or like Station 1) collects and focuses radio waves — either receiving them from space or transmitting them toward a specific set of celestial coordinates. The parabolic shape ensures the signal is concentrated in a beam rather than radiating in all directions, significantly increasing effective range.
The frequency determines how the signal propagates and who might detect it. At 1420 MHz — the hydrogen line — the signal occupies the frequency most universally associated with interstellar communication.
Once transmitted, the signal is beyond anyone's control. It travels at light speed, outward, indefinitely.
Can we broadcast to specific planets?
We can broadcast toward specific stars — and by extension, any planets that might orbit them. We cannot target individual planets directly because, at interstellar distances, the resolution of even a large dish antenna is far too low to distinguish a planet from its star. We aim at the star, and any planet in the system is within the signal's cone.
Within our own solar system, we communicate with specific spacecraft — Voyager, New Horizons, the Mars rovers — using tight directional beams. NASA's Deep Space Network aims signals at specific vehicles and receives signals from them with extraordinary precision.
For interstellar distances, we can aim at a star system but not at a specific planet within it. At 4.37 light-years, even a very tight beam has a footprint of billions of kilometers by the time it arrives.
Within our own solar system, we communicate with specific spacecraft — Voyager, New Horizons, the Mars rovers — using tight directional beams. NASA's Deep Space Network aims signals at specific vehicles and receives signals from them with extraordinary precision.
For interstellar distances, we can aim at a star system but not at a specific planet within it. At 4.37 light-years, even a very tight beam has a footprint of billions of kilometers by the time it arrives.
The ethical debate: should we broadcast to space?
The question of whether humanity should intentionally broadcast our location and existence to potential extraterrestrial civilizations is genuinely debated among scientists and philosophers.
Against intentional broadcasting (METI skeptics): The late Stephen Hawking was among the most prominent voices warning against active messaging. His argument: a civilization capable of detecting our signals would likely be technologically far superior to us, and the outcome of first contact could be catastrophic — analogous to what happened when technologically advanced European civilizations encountered indigenous peoples in the Americas.
For intentional broadcasting: SETI researcher Jill Tarter and others argue that Earth has already been broadcasting for over a century — if something dangerous is out there within 130 light-years, it already knows we exist. Additionally, the assumption that a technologically superior civilization would be hostile is anthropocentric speculation. A civilization that survived long enough to develop interstellar travel might have evolved beyond the aggression that characterizes early civilizations.
Cosmic Echo's position: we believe the impulse to communicate is fundamentally human, that the probability of dangerous detection is extremely low, and that our transmissions are modest compared to the century of unintentional broadcasting Earth has already performed.
Against intentional broadcasting (METI skeptics): The late Stephen Hawking was among the most prominent voices warning against active messaging. His argument: a civilization capable of detecting our signals would likely be technologically far superior to us, and the outcome of first contact could be catastrophic — analogous to what happened when technologically advanced European civilizations encountered indigenous peoples in the Americas.
For intentional broadcasting: SETI researcher Jill Tarter and others argue that Earth has already been broadcasting for over a century — if something dangerous is out there within 130 light-years, it already knows we exist. Additionally, the assumption that a technologically superior civilization would be hostile is anthropocentric speculation. A civilization that survived long enough to develop interstellar travel might have evolved beyond the aggression that characterizes early civilizations.
Cosmic Echo's position: we believe the impulse to communicate is fundamentally human, that the probability of dangerous detection is extremely low, and that our transmissions are modest compared to the century of unintentional broadcasting Earth has already performed.
What happens when you broadcast your message with Cosmic Echo
Your message is encoded in binary, transmitted at 1420 MHz from a parabolic dish at Station 1 in the Northern Hemisphere, aimed at the star you chose. The entire process — from order to leaving Earth — takes approximately 6 hours.
After transmission:
• You receive an email: "Your transmission has left Earth"
• Your Signal Tracker activates — real-time distance from Earth, updated every second
• Your Transmission Certificate (digital, printed, or framed) documents the event permanently
You are adding your message to a tradition that began with Marconi's first signals and runs through the Arecibo message, Cosmic Call, and everything in between. Not as an institution, not as a government, not as a committee — as a person with something to say, sending it into the only medium that travels at the speed of light.
After transmission:
• You receive an email: "Your transmission has left Earth"
• Your Signal Tracker activates — real-time distance from Earth, updated every second
• Your Transmission Certificate (digital, printed, or framed) documents the event permanently
You are adding your message to a tradition that began with Marconi's first signals and runs through the Arecibo message, Cosmic Call, and everything in between. Not as an institution, not as a government, not as a committee — as a person with something to say, sending it into the only medium that travels at the speed of light.
~6 hours
Time to transmission
1420 MHz
Hydrogen line frequency
299,792 km/s
Signal speed
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