How does sending a message to space actually work?
Cosmic Echo encodes your personal message into binary and transmits it as a radio signal at 1420 MHz — the hydrogen line, the most universally significant frequency in radio astronomy. The signal is broadcast from a parabolic dish antenna at Station 1 in the Northern Hemisphere, aimed at the astronomical destination you choose.
Once transmitted, your message travels at the speed of light — 299,792 kilometers per second. That's fast enough to circle the Earth 7.5 times in a single second. Within 1.3 seconds, your message passes the Moon. Within 8 minutes, it passes the Sun. Within a few hours, it's beyond Mars. And it never stops.
The technology is not new or experimental. Radio signals are how humanity has communicated with every deep space probe ever launched — from Pioneer 10 (1972) to Voyager 1 (1977) to New Horizons (2006). Your message uses the same fundamental physics. The only difference is the destination: not a spacecraft, but the stars themselves.
Once transmitted, your message travels at the speed of light — 299,792 kilometers per second. That's fast enough to circle the Earth 7.5 times in a single second. Within 1.3 seconds, your message passes the Moon. Within 8 minutes, it passes the Sun. Within a few hours, it's beyond Mars. And it never stops.
The technology is not new or experimental. Radio signals are how humanity has communicated with every deep space probe ever launched — from Pioneer 10 (1972) to Voyager 1 (1977) to New Horizons (2006). Your message uses the same fundamental physics. The only difference is the destination: not a spacecraft, but the stars themselves.
Why 1420 MHz? The universal frequency
The 1420 MHz frequency — also known as the hydrogen line or the 21-centimeter line — is the emission frequency of neutral hydrogen, the most abundant element in the universe. Radio astronomers consider it the most natural frequency for interstellar communication because any technologically advanced civilization would be aware of it.
This isn't speculation. The Search for Extraterrestrial Intelligence (SETI) has focused on this frequency band since the 1960s. The famous Arecibo message in 1974 — humanity's most powerful intentional broadcast to space — was transmitted at 2380 MHz, but the hydrogen line remains the gold standard for passive listening. When Cosmic Echo transmits your message at 1420 MHz, it's using the frequency that the global scientific community considers most likely to be monitored by intelligent life.
This isn't speculation. The Search for Extraterrestrial Intelligence (SETI) has focused on this frequency band since the 1960s. The famous Arecibo message in 1974 — humanity's most powerful intentional broadcast to space — was transmitted at 2380 MHz, but the hydrogen line remains the gold standard for passive listening. When Cosmic Echo transmits your message at 1420 MHz, it's using the frequency that the global scientific community considers most likely to be monitored by intelligent life.
Choose your destination star
Every Cosmic Echo transmission is aimed at a real astronomical target. You're not sending a message into a void — you're aiming at a specific point in the sky with real scientific significance:
Alpha Centauri — The nearest star system to Earth at 4.37 light-years. A triple star system that includes Proxima Centauri, which hosts an Earth-sized planet (Proxima Centauri b) in the habitable zone. Your message arrives in 4.37 years.
Vega — One of the brightest stars visible from Earth, 25 light-years away in the constellation Lyra. The first star ever photographed (1850) and the first to have its spectrum analyzed. A beacon of astronomical history.
Polaris — The North Star, 433 light-years away. For thousands of years it has guided travelers, navigators, and dreamers. Sending a message to Polaris carries a deep human symbolism.
Sagittarius A* — The supermassive black hole at the center of our Milky Way galaxy, 26,000 light-years away. Four million times the mass of our Sun. The ultimate destination.
Deep Space — No specific target. Your message is aimed outward into the cosmic void, traveling forever with no particular destination. Some people find this the most poetic option.
Alpha Centauri — The nearest star system to Earth at 4.37 light-years. A triple star system that includes Proxima Centauri, which hosts an Earth-sized planet (Proxima Centauri b) in the habitable zone. Your message arrives in 4.37 years.
Vega — One of the brightest stars visible from Earth, 25 light-years away in the constellation Lyra. The first star ever photographed (1850) and the first to have its spectrum analyzed. A beacon of astronomical history.
Polaris — The North Star, 433 light-years away. For thousands of years it has guided travelers, navigators, and dreamers. Sending a message to Polaris carries a deep human symbolism.
Sagittarius A* — The supermassive black hole at the center of our Milky Way galaxy, 26,000 light-years away. Four million times the mass of our Sun. The ultimate destination.
Deep Space — No specific target. Your message is aimed outward into the cosmic void, traveling forever with no particular destination. Some people find this the most poetic option.
The science behind radio signal propagation
Radio waves are a form of electromagnetic radiation — the same category that includes visible light, X-rays, and microwaves. In the vacuum of space, radio waves travel at exactly the speed of light: 299,792,458 meters per second. Unlike sound, they don't need a medium to propagate through.
A radio signal weakens with distance according to the inverse-square law — double the distance, quarter the power. But the signal energy never reaches zero. It continues propagating indefinitely, spreading outward as an ever-expanding sphere. Voyager 1, launched in 1977, still communicates with Earth from over 24 billion kilometers away using a 23-watt radio transmitter — roughly the power of a refrigerator light bulb.
Your Cosmic Echo message is part of a concentrated batch transmission with significantly more power than Voyager's transmitter. While the signal becomes undetectable to our instruments at great distances, the electromagnetic energy itself continues moving through space at light speed for millions of years.
A radio signal weakens with distance according to the inverse-square law — double the distance, quarter the power. But the signal energy never reaches zero. It continues propagating indefinitely, spreading outward as an ever-expanding sphere. Voyager 1, launched in 1977, still communicates with Earth from over 24 billion kilometers away using a 23-watt radio transmitter — roughly the power of a refrigerator light bulb.
Your Cosmic Echo message is part of a concentrated batch transmission with significantly more power than Voyager's transmitter. While the signal becomes undetectable to our instruments at great distances, the electromagnetic energy itself continues moving through space at light speed for millions of years.
What happens after you purchase
Your message is encoded into binary, prepared as a transmission payload, and queued for broadcast from the dish at Station 1 in the Northern Hemisphere. Approximately 6 hours after purchase, your signal leaves Earth.
Each message is transmitted individually with metadata — sender name, recipient (if applicable), and destination coordinates. The entire payload is also archived in our database with cryptographic verification.
After transmission, you receive an email confirming your message has left Earth. The Signal Tracker activates immediately, showing real-time distance calculations from Earth.
Each message is transmitted individually with metadata — sender name, recipient (if applicable), and destination coordinates. The entire payload is also archived in our database with cryptographic verification.
After transmission, you receive an email confirming your message has left Earth. The Signal Tracker activates immediately, showing real-time distance calculations from Earth.
Your Transmission Certificate
Every message comes with a verified Transmission Certificate — a permanent, tamper-proof record of your signal. The certificate includes:
• Your message text (exactly as transmitted)
• Sender and recipient names
• Destination star and its distance in light-years
• Transmission date and batch number
• Station name and coordinates
• Signal frequency (1420 MHz)
• A unique SHA-256 cryptographic verification hash
The Digital Certificate (PDF) is included with every purchase. The Printed Certificate ($49) is a premium physical document shipped to your address. The Framed Certificate ($99) arrives museum-quality and ready to hang.
• Your message text (exactly as transmitted)
• Sender and recipient names
• Destination star and its distance in light-years
• Transmission date and batch number
• Station name and coordinates
• Signal frequency (1420 MHz)
• A unique SHA-256 cryptographic verification hash
The Digital Certificate (PDF) is included with every purchase. The Printed Certificate ($49) is a premium physical document shipped to your address. The Framed Certificate ($99) arrives museum-quality and ready to hang.
Live Signal Tracking
Your Signal Tracker page is a living document. From the moment of transmission, it calculates and displays your message's current distance from Earth in real-time — updated every second.
Watch your message pass the Moon (1.3 light-seconds away), then the Sun (8.3 light-minutes), then Mars (3–22 light-minutes depending on orbital position), then Jupiter (33–54 light-minutes). Within hours of transmission, your message exits the inner solar system. Within a day, it's further than Pluto.
Check your tracker a year later and see your message one light-year from Earth — 9.46 trillion kilometers away. The tracker works indefinitely. It becomes a personal, permanent connection to your signal as it crosses the galaxy.
Watch your message pass the Moon (1.3 light-seconds away), then the Sun (8.3 light-minutes), then Mars (3–22 light-minutes depending on orbital position), then Jupiter (33–54 light-minutes). Within hours of transmission, your message exits the inner solar system. Within a day, it's further than Pluto.
Check your tracker a year later and see your message one light-year from Earth — 9.46 trillion kilometers away. The tracker works indefinitely. It becomes a personal, permanent connection to your signal as it crosses the galaxy.
Who sends messages to space?
Thousands of people from every background imaginable. Parents sending messages on behalf of newborn children — their first words to the universe. Couples sending love letters to the stars. People honoring loved ones they've lost. Scientists, poets, comedians, grandparents, teenagers. Some write profound reflections on humanity. Others write jokes. Some simply write their name — a way of saying "I was here."
Messages can be public (displayed on the Signal Explorer) or completely private. You choose. There's no judgment, no moderation of tone or content (within legal limits). Your message, your words, your moment.
Messages can be public (displayed on the Signal Explorer) or completely private. You choose. There's no judgment, no moderation of tone or content (within legal limits). Your message, your words, your moment.
Pricing and what's included
The founders price is $19 — available for everyone until June 1, 2026. After that, the standard price is $29.
Digital — $19 (founders) / $29 (standard): Real radio transmission, digital Transmission Certificate (PDF), live Signal Tracker page, message up to 100 words, choice of destination star.
Printed — $49: Everything in Digital, plus a premium printed certificate shipped to any address worldwide.
Framed — $99: Everything in Printed, plus museum-quality framing, ready to display. The perfect space gift.
Digital — $19 (founders) / $29 (standard): Real radio transmission, digital Transmission Certificate (PDF), live Signal Tracker page, message up to 100 words, choice of destination star.
Printed — $49: Everything in Digital, plus a premium printed certificate shipped to any address worldwide.
Framed — $99: Everything in Printed, plus museum-quality framing, ready to display. The perfect space gift.
Example
What your Transmission Certificate looks like
Every message gets a verified certificate with your signal ID, message text, destination, station, and a cryptographic hash. Here’s a sample (same HTML as the real certificate, with destination background):
~6 hours
Time to transmission
1420 MHz
Hydrogen line frequency
299,792 km/s
Signal speed
$19
Founders price until Jun 1
Frequently Asked Questions
Everything you need to know
Your words deserve to travel forever
Founders price $19 for everyone until June 1, 2026. Your message transmits within hours.
Send Your Message