--- title: What is a light-day? The milestone Voyager 1 is closing... description: Voyager 1 will reach one light-day from Earth, a distance no other human-made object has reached, on Nov. 18, 2026 at 5:16:07 a.m. EST. That distance equals... canonical: https://daily.dev/posts/what-is-a-light-day-the-milestone-voyager-1-is-closing-in-on-rqlknoosq twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: What is a light-day? The milestone Voyager 1 is closing in on | daily.dev og:description: Voyager 1 will reach one light-day from Earth, a distance no other human-made object has reached, on Nov. 18, 2026 at 5:16:07 a.m. EST. That distance equals... og:url: https://daily.dev/posts/what-is-a-light-day-the-milestone-voyager-1-is-closing-in-on-rqlknoosq og:image: https://api.daily.dev/og/posts/RQlKnoOSq.png og:image:alt: What is a light-day? The milestone Voyager 1 is closing in on og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # What is a light-day? The milestone Voyager 1 is closing in on **[Hacker News](https://daily.dev/sources/hn)** · 3 min read · 0 upvotes · 0 comments ## Summary Voyager 1 will reach one light-day from Earth, a distance no other human-made object has reached, on Nov. 18, 2026 at 5:16:07 a.m. EST. That distance equals about 16 billion miles (26 billion kilometers). The spacecraft, in flight since 1977, will have taken 49 years, two months and 11 days to cover it. Its twin, Voyager 2, which took a different path to visit Uranus and Neptune, is on pace to reach the same milestone in November 2035. Voyager 1 is now headed toward a star called AC +79 3888, over 17 light-years away, and will pass within 1.7 light-years of it in about 40,000 years. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### When will Voyager 1 reach one light-day away from Earth? Voyager 1 will reach one light-day from Earth on Wednesday, November 18, 2026, at 5:16:07 a.m. EST. That distance equals about 16 billion miles (26 billion kilometers). By that point the spacecraft, launched in 1977, will have taken 49 years, two months, and 11 days to cover the distance. _Space milestones like this one are easy to track alongside other tech and science news on daily.dev._ ### How far away is one light-day in miles? One light-day equals 16,094,799,096 miles, or about 25,902,068,356 kilometers. That is the distance light travels in 24 hours moving at roughly 186,000 miles per second. For comparison, Neptune is only about four light-hours and ten light-minutes from Earth, far short of a full light-day. _Readers curious about space-scale measurements can follow more explainers like this on daily.dev._ ### How does Voyager 1's distance compare to Voyager 2's? Voyager 2 is about nine years behind Voyager 1 in reaching the one-light-day mark, expected in November 2035. Both launched in 1977 but took different paths: Voyager 2 visited Uranus and Neptune, taking 12 years at about 35,000 miles per hour just to reach Neptune, while Voyager 1 heads toward a star called AC +79 3888 over 17 light-years away. _Those tracking long-running missions can keep up with updates like these on daily.dev._ ## Community take How the wider developer community reacted, aggregated from 1 discussion and 34 comments across hackernews (as of 2026-10-31). **TL;DR:** Commenters mostly marvel at the engineering feat of still communicating with Voyager 1 across such vast distances, with technical tangents about signal physics, speed, and solar system boundaries, plus reflective asides about the Golden Record and humanity's place in the universe. **Sentiment:** 55% positive · 35% mixed · 10% skeptical **The case for** - Several note it's remarkable that signals can still be received from Voyager given the extreme distance and 50-year-old hardware. - Some praise the directional high-gain antenna design as cleverly mitigating the expected signal loss. - Reflections on the Golden Record and Carl Sagan's writing are seen as a meaningful, authentic human message to the cosmos. **The pushback** - A side debate over whether free-space path loss math is being applied correctly got contentious without much consensus. - A few note the ambiguous frame of reference for Voyager's stated speed in the source article was unclear and under-explained. - Some point out the notion of 'leaving the solar system' is murky and poorly defined, undercutting milestone framing. **By community** - hackernews (mixed): Discussion blends genuine technical appreciation for the communication feat with digressions into physics nitpicking, speed-of-light tangents, and nostalgic reflections on the Golden Record. **Hottest debate:** Whether the inverse-square free-space path loss formula is being correctly invoked given Voyager's high-gain directional antenna. **Open questions** - What exact frame of reference (Sun, Earth, or launch point) does the stated 38,000 mph speed use? - Is there any theoretical way Voyager 1 could still be accelerating? **Highlights** > 1/r² is for an isotropic radiator, but Voyager 1 mounts (thankfully) a high gain directional antenna. The gains seem to be 36dBi or 48dBi, depending on the frequency [1]. This means that when pointed towards Earth, the signal power is actually between 4000 to 63000 times stronger than what that formula would give you. It's still tiny, but not as bad as that would suggest. [1]: https://space.stackexchange.com/questions/65801/what-are-the... > — [rnhmjoj on hackernews · 2 comments](https://news.ycombinator.com/item?id=50318072) > I'm just going to repost stuff from my blog about the Voyager space probes. I've posted this here before - The two Voyager spacecraft are the greatest love letters humanity has ever sent into the void. Voyager 2 actually launched first, on August 20, 1977, followed by Voyager 1 on September 5, 1977. Because Voyager 1 was on a faster, shorter trajectory (it used a rare alignment to slingshot past both Jupiter and Saturn quicker), it overtook its twin and became the farther, faster probe. As of 2025, Voyager 1 is the most distant human-made object ever, more than 24 billion kilometers away, still whispering data home at 160 bits per second. Each spacecraft carries an identical 12-inch gold-plated copper phonograph record. The contents: - Greetings in 55 human languages. - A message from UN Secretary-General at the time and one from U.S. President Jimmy Carter. - 115 analog images encoded in the record’s grooves: how to build the stylus and play the record, the solar system’s location using 14 pulsars as galactic GPS, diagrams of human DNA, photos of a supermarket, a sunset, a fetus, people eating, licking ice cream, and dancing The record is encased in an aluminum jacket with instructions etched on the cover: a map of the pulsars, the hydrogen atom diagram so aliens can decode the time units, and a tiny sample of uranium-238 so they can carbon-date how old the record is when they find it. Sagan wanted the record to be a message in a bottle for a billion years. The spacecraft themselves are expected to outlive Earth. In a billion years, when the Sun swells into a red giant and maybe swallows Earth, the Voyagers will still be cruising the Milky Way, silent gold disks carrying blind, naked humans waving hello to a universe that may never wave back. And it was Sagan who, in 1989, when Voyager 1 was already beyond Neptune and its cameras were scheduled to be turned off forever to save power, begged NASA for one last maneuver. On Valentine’s Day 1990, the spacecraft turned around, took 60 final images, and captured Earth as a single pale blue pixel floating in a scattered beam of sunlight — the photograph that gives the book its name and its soul. It was the photograph that inspired this famous quote - "Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there-on a mote of dust suspended in a sunbeam. The Earth is a very small stage in a vast cosmic arena. Think of the endless cruelties visited by the inhabitants of one corner of this pixel on the scarcely distinguishable inhabitants of some other corner, how frequent their misunderstandings, how eager they are to kill one another, how fervent their hatreds. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot. Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves. The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make ou > — [chistev on hackernews](https://news.ycombinator.com/item?id=50319052) > Voyager I is leaving the solar system again! [1] [1] https://xkcd.com/1189/ > — [Animats on hackernews · 1 comments](https://news.ycombinator.com/item?id=50318744) > Maybe the answer to the Fermi paradox is that the universe is so big that you simply never get anywhere. No message you send out ever gets far enough for anyone to see it. No ship you send out ever reaches another system. It’s just a big empty void. You stay in your own lame system, browsing lame terrestrial memes and never escape. > — [MisterMunchkin on hackernews](https://news.ycombinator.com/item?id=50319550) > The Voyager Mission Status page has real-time updating distances, speeds (relative to the Sun), and light times for both Voyagers: https://science.nasa.gov/mission/voyager/where-are-voyager-1... You're right that Earth is catching up to the Voyagers during part of its orbit for several months in the early part of the year (and you'll see that reflected on the Mission Status page). Consequently I used to wonder if Voyager 1 would reach 1 light day from Earth 3 times - the first time, then a second time when the Earth distance decreased, and then a third time when distance increased again! If you scroll down on this TheSkyLive page, you can see a graph of Voyager 1's distance from Earth over time and it's an up-sloping ripple instead of a straight line. You can play with the markers to zoom in and see that the catch-up phase happens in the early part of the year: https://theskylive.com/voyager1-info https://theskylive.com/voyager2-info > — [mek6800d2 on hackernews](https://news.ycombinator.com/item?id=50318641) **Source threads** - [hackernews](https://news.ycombinator.com/item?id=50317429) · 61 points · 34 comments ## Similar posts on daily.dev - [A 1977 Time Capsule, Voyager 1 runs on 69 KB of memory and an 8-track tape recorder](https://daily.dev/posts/a-1977-time-capsule-voyager-1-runs-on-69-kb-of-memory-and-an-8-track-tape-recorder-ubttkbz9t) · Hacker News · 5 upvotes · 2 comments - [NASA’s Just Prolonged Voyager 2’s Science Mission With A Big Bang](https://daily.dev/posts/nasa-s-just-prolonged-voyager-2-s-science-mission-with-a-big-bang-dinvk0y4m) · Hackaday · 0 upvotes · 0 comments - [How AI plotted an interstellar journey to Alpha Centauri](https://daily.dev/posts/how-ai-plotted-an-interstellar-journey-to-alpha-centauri-tbzlvqiuy) · MIT Technology Review · 0 upvotes · 0 comments - [NASA Shuts Off Instrument on Voyager 1 to Keep Spacecraft Operating](https://daily.dev/posts/nasa-shuts-off-instrument-on-voyager-1-to-keep-spacecraft-operating-5gbpqnewd) · Hacker News · 0 upvotes · 0 comments - [Four astronauts begin humanity’s return to the moon](https://daily.dev/posts/four-astronauts-begin-humanity-s-return-to-the-moon-tcowp1mnm) · TechCentral · 0 upvotes · 0 comments --- Tags: [#nasa](https://daily.dev/tags/nasa) [View this post on daily.dev](https://daily.dev/posts/what-is-a-light-day-the-milestone-voyager-1-is-closing-in-on-rqlknoosq) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"What is a light-day? 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