Voyager 1 still calls home at 160 bits per second
A 23-watt transmitter, a whisper fainter than an attowatt, and three giant dishes on Earth — the choreography behind humanity's most distant conversation.
Tonight, a 70-meter dish will hold perfectly still for hours, pointed at a patch of sky, listening for a signal about a billionth of a billionth of a watt strong. It's Voyager 1, calling home from more than 25 billion kilometers away.
And that whisper carries almost nothing: 160 bits per second, Voyager 1's primary cruise data rate (DESCANSO). Twenty characters a second. At Jupiter in 1979, it managed 115,200.
Hearing a signal this faint takes the biggest ears on Earth — and there are only three 70-meter dishes. The Deep Space Network is oversubscribed by up to 40%, and Voyager 2 alone was shorted 8,500–15,000 requested tracking hours over five years (NASA OIG).
Talking back is slower still: commands go up at 16 bits per second, roughly your typing speed on a bad day. One-way light time runs about 23 hours 53 minutes, so a round-trip conversation takes two days.
Even the hardware is on borrowed time. In October 2024 a fault silenced the X-band transmitter entirely, and Voyager 1 fell back to S-band — a frequency unused since 1981 — before engineers coaxed X-band back to life that November.
On November 18, 2026, at 2:16 a.m. Pacific, Voyager 1 crosses one light-day from Earth. From that day forward, every hello and every answer between us spans 48 hours.
My opinion, offered as exactly that: 160 bits per second is the most beautiful data rate that has ever existed. A 49-year-old machine, two instruments left, a refrigerator bulb of power — still saying "still here," twenty characters at a time.
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